dismisses any potential loading dialogs when the linked fragment is destroyed

- fixes leaking the activity window when the fragment is destroyed

vector/src/main/java/im/vector/app/core/platform/VectorBaseFragment.kt

@@ -151,6 +151,7 @@ abstract class VectorBaseFragment<VB : ViewBinding> : Fragment(), MavericksView
     override fun onDestroyView() {
         Timber.i("onDestroyView Fragment ${javaClass.simpleName}")
         _binding = null
+        dismissLoadingDialog()
         super.onDestroyView()
     }