Fixed that listeners get called off UI thread

ui/BankingAndroidApp/src/main/java/net/dankito/banking/ui/android/util/CurrentActivityTracker.kt

@@ -43,9 +43,11 @@ open class CurrentActivityTracker {
             nextActivitySetListeners.clear()
 
             Timer().schedule(500) { // wait some time till activity is initialized
+                activity.runOnUiThread {
                     listenersCopy.forEach { it(activity) }
                 }
             }
         }
+    }
 
 }