(android) Fix back button behaviour for lnurl actions

Specifically, for a LN withdrawal, a successful withdraw should not
lead back to the scanner screen (which will reattempt the withdraw)
but to the home screen.

Author: dpad85

phoenix-android/src/main/kotlin/fr/acinq/phoenix/android/payments/LnurlAuthView.kt

@@ -39,7 +39,8 @@ fun LnurlAuthView(
     model: Scan.Model.LnurlAuthFlow,
     onBackClick: () -> Unit,
     onLoginClick: (Scan.Intent.LnurlAuthFlow) -> Unit,
-    onAuthSchemeInfoClick: () -> Unit
+    onAuthSchemeInfoClick: () -> Unit,
+    onAuthDone: () -> Unit,
 ) {
     var showHowItWorks by remember { mutableStateOf(false) }
     val prefAuthScheme by userPrefs.getLnurlAuthScheme.collectAsState(initial = null)
@@ -131,7 +132,7 @@ fun LnurlAuthView(
                         Text(text = stringResource(id = R.string.lnurl_auth_success, model.auth.initialUrl.host), textAlign = TextAlign.Center)
                     }
                     Spacer(Modifier.height(32.dp))
-                    FilledButton(text = stringResource(id = R.string.btn_ok), icon = R.drawable.ic_check, onClick = onBackClick)
+                    FilledButton(text = stringResource(id = R.string.btn_ok), icon = R.drawable.ic_check, onClick = onAuthDone)
                 }
             }
         }

phoenix-android/src/main/kotlin/fr/acinq/phoenix/android/payments/LnurlWithdrawView.kt

@@ -44,9 +44,9 @@ import fr.acinq.phoenix.data.lnurl.LnurlError
 @Composable
 fun LnurlWithdrawView(
     model: Scan.Model.LnurlWithdrawFlow,
-    onBackClick: () -> Unit,
     onWithdrawClick: (Scan.Intent.LnurlWithdrawFlow) -> Unit,
     onFeeManagementClick: () -> Unit,
+    onWithdrawDone: () -> Unit,
 ) {
     val context = LocalContext.current
     val prefUnit = preferredAmountUnit
@@ -57,7 +57,7 @@ fun LnurlWithdrawView(
     var amountErrorMessage by remember { mutableStateOf("") }
 
     SplashLayout(
-        header = { DefaultScreenHeader(onBackClick = onBackClick) },
+        header = { DefaultScreenHeader(onBackClick = onWithdrawDone) },
         topContent = {
             Text(text = annotatedStringResource(R.string.lnurl_withdraw_header, model.lnurlWithdraw.initialUrl.host), textAlign = TextAlign.Center)
             Spacer(modifier = Modifier.height(16.dp))
@@ -131,7 +131,7 @@ fun LnurlWithdrawView(
                     textAlign = TextAlign.Center
                 )
                 Spacer(Modifier.height(12.dp))
-                BorderButton(text = stringResource(id = R.string.btn_ok), icon = R.drawable.ic_check_circle, onClick = onBackClick)
+                BorderButton(text = stringResource(id = R.string.btn_ok), icon = R.drawable.ic_check_circle, onClick = onWithdrawDone)
             }
         }
     }

phoenix-android/src/main/kotlin/fr/acinq/phoenix/android/payments/ScanDataView.kt

@@ -162,10 +162,21 @@ fun ScanDataView(
                 )
             }
             is Scan.Model.LnurlAuthFlow -> {
-                LnurlAuthView(model = model, onBackClick = onBackClick, onLoginClick = { postIntent(it) }, onAuthSchemeInfoClick = onAuthSchemeInfoClick)
+                LnurlAuthView(
+                    model = model,
+                    onBackClick = onBackClick,
+                    onLoginClick = { postIntent(it) },
+                    onAuthSchemeInfoClick = onAuthSchemeInfoClick,
+                    onAuthDone = onProcessingFinished,
+                )
             }
             is Scan.Model.LnurlWithdrawFlow -> {
-                LnurlWithdrawView(model = model, onBackClick = onBackClick, onWithdrawClick = { postIntent(it) }, onFeeManagementClick = onFeeManagementClick)
+                LnurlWithdrawView(
+                    model = model,
+                    onWithdrawClick = { postIntent(it) },
+                    onFeeManagementClick = onFeeManagementClick,
+                    onWithdrawDone = onProcessingFinished,
+                )
             }
         }
     }