fix (join room) : do not navigate up when join is successful

Author: ganfra

features/joinroom/impl/src/main/kotlin/io/element/android/features/joinroom/impl/JoinRoomFlowNode.kt

@@ -79,7 +79,7 @@ class JoinRoomFlowNode @AssistedInject constructor(
             JoinRoomView(
                 state = state,
                 onBackClick = ::navigateUp,
-                onJoinSuccess = ::navigateUp,
+                onJoinSuccess = {},
                 onForgetSuccess = ::navigateUp,
                 onCancelKnockSuccess = {},
                 onKnockSuccess = {},