Improve code on ShareNode

appnav/src/main/kotlin/io/element/android/appnav/LoggedInFlowNode.kt

@@ -469,9 +469,8 @@ class LoggedInFlowNode(
                     .callback(object : ShareEntryPoint.Callback {
                         override fun onDone(roomIds: List<RoomId>) {
                             navigateUp()
-                            if (roomIds.size == 1) {
-                                val targetRoomId = roomIds.first()
-                                backstack.push(NavTarget.Room(targetRoomId.toRoomIdOrAlias()))
+                            roomIds.singleOrNull()?.let { roomId ->
+                                backstack.push(NavTarget.Room(roomId.toRoomIdOrAlias()))
                             }
                         }
                     })

features/share/impl/src/main/kotlin/io/element/android/features/share/impl/ShareNode.kt

@@ -61,7 +61,7 @@ class ShareNode(
             }
 
             override fun onCancel() {
-                navigateUp()
+                onShareDone(emptyList())
             }
         }
 
@@ -82,12 +82,12 @@ class ShareNode(
             val state = presenter.present()
             ShareView(
                 state = state,
-                onShareSuccess = ::onShareSuccess,
+                onShareSuccess = ::onShareDone,
             )
         }
     }
 
-    private fun onShareSuccess(roomIds: List<RoomId>) {
+    private fun onShareDone(roomIds: List<RoomId>) {
         callbacks.forEach { it.onDone(roomIds) }
     }
 }