fix tests for the read message guard

Signed-off-by: Marcel Hibbe <dev@mhibbe.de>

Author: mahibi

app/src/test/java/com/nextcloud/talk/chat/viewmodels/ChatViewModelTest.kt

@@ -31,15 +31,18 @@ class ChatViewModelTest {
     @Test
     fun `isPlausibleLastReadMessageId returns true within the buffer above the newest known message id`() {
         assertTrue(
-            ChatViewModel.isPlausibleLastReadMessageId(messageId = 158761 + 2000, newestKnownRealMessageId = 158761L)
+            ChatViewModel.isPlausibleLastReadMessageId(
+                messageId = 158761 + 10_000,
+                newestKnownRealMessageId = 158761L
+            )
         )
     }
 
     @Test
     fun `isPlausibleLastReadMessageId returns false just beyond the buffer above the newest known message id`() {
         assertFalse(
             ChatViewModel.isPlausibleLastReadMessageId(
-                messageId = 158761 + 2000 + 1,
+                messageId = 158761 + 10_000 + 1,
                 newestKnownRealMessageId = 158761L
             )
         )