remove scope cancelation for handleChatOnBackPress (replace with lifecyle event)

handleOnStop will handle this (and more scenarios than just backpress)

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

app/src/main/java/com/nextcloud/talk/chat/ChatActivity.kt

@@ -348,7 +348,6 @@ class ChatActivity :
 
     private val onBackPressedCallback = object : OnBackPressedCallback(true) {
         override fun handleOnBackPressed() {
-            chatViewModel.handleChatOnBackPress()
             if (currentlyPlayedVoiceMessage != null) {
                 stopMediaPlayer(currentlyPlayedVoiceMessage!!)
             }

app/src/main/java/com/nextcloud/talk/chat/data/ChatMessageRepository.kt

@@ -74,11 +74,6 @@ interface ChatMessageRepository : LifecycleAwareManager {
      */
     suspend fun getMessage(messageId: Long, bundle: Bundle): Flow<ChatMessage>
 
-    /**
-     * Destroys unused resources.
-     */
-    fun handleChatOnBackPress()
-
     @Suppress("LongParameterList")
     suspend fun sendChatMessage(
         credentials: String,

app/src/main/java/com/nextcloud/talk/chat/data/network/OfflineFirstChatRepository.kt

@@ -806,10 +806,6 @@ class OfflineFirstChatRepository @Inject constructor(
         scope.cancel()
     }
 
-    override fun handleChatOnBackPress() {
-        scope.cancel()
-    }
-
     @Suppress("LongParameterList")
     override suspend fun sendChatMessage(
         credentials: String,

app/src/main/java/com/nextcloud/talk/chat/viewmodels/ChatViewModel.kt

@@ -647,10 +647,6 @@ class ChatViewModel @Inject constructor(
         _getCapabilitiesViewState.value = GetCapabilitiesStartState
     }
 
-    fun handleChatOnBackPress() {
-        chatRepository.handleChatOnBackPress()
-    }
-
     fun getMessageById(url: String, conversationModel: ConversationModel, messageId: Long): Flow<ChatMessage> =
         flow {
             val bundle = Bundle()