refactor(core): remove 0px fallback

Author: brandyscarney

core/src/css/ionic/core.ionic.scss

@@ -223,10 +223,10 @@ html.plt-ios.plt-pwa {
   html {
     // `--safe-area-inset-*` are set by Capacitor
     // @see https://capacitorjs.com/docs/apis/system-bars#android-note
-    --ion-safe-area-top: var(--safe-area-inset-top, env(safe-area-inset-top, 0px));
-    --ion-safe-area-bottom: var(--safe-area-inset-bottom, env(safe-area-inset-bottom, 0px));
-    --ion-safe-area-left: var(--safe-area-inset-left, env(safe-area-inset-left, 0px));
-    --ion-safe-area-right: var(--safe-area-inset-right, env(safe-area-inset-right, 0px));
+    --ion-safe-area-top: var(--safe-area-inset-top, env(safe-area-inset-top));
+    --ion-safe-area-bottom: var(--safe-area-inset-bottom, env(safe-area-inset-bottom));
+    --ion-safe-area-left: var(--safe-area-inset-left, env(safe-area-inset-left));
+    --ion-safe-area-right: var(--safe-area-inset-right, env(safe-area-inset-right));
   }
 }