Set fragment title and [un]register callbacks in onStart/onStop

onStart() is called when the fragment is made visible, whereas onPause()
is called when the fragment looses focus e.g. if a dialog is shown.
Thus:
- there is no need to set the activity's title everytime the fragment
regains focus,
- it is better to listen to event tasks and refresh the state of the UI
while the fragment is actually visible, listening to events until the
fragment is destroyed is useless: if an event is received between
onStop() and onDestroy(), there will be some processing but nothing will
be shown because the fragment is no longer visible.

app/src/main/java/com/topjohnwu/magisk/ModulesFragment.java

@@ -93,16 +93,16 @@ public class ModulesFragment extends Fragment implements CallbackHandler.EventLi
     }
 
     @Override
-    public void onResume() {
-        super.onResume();
+    public void onStart() {
+        super.onStart();
         CallbackHandler.register(moduleLoadDone, this);
         getActivity().setTitle(R.string.modules);
     }
 
     @Override
-    public void onDestroy() {
-        super.onDestroy();
+    public void onStop() {
         CallbackHandler.unRegister(moduleLoadDone, this);
+        super.onStop();
     }
 
     private void updateUI() {