Matching event [un]registering, call super at the end of onPause/onDestroy

Event unregistered in onDestroy() should be registered in onCreate() to
avoid being registered multiple times.

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

@@ -131,8 +131,8 @@ public class SettingsActivity extends AppCompatActivity {
 
         @Override
         public void onDestroy() {
-            super.onDestroy();
             prefs.unregisterOnSharedPreferenceChangeListener(this);
+            super.onDestroy();
         }
 
         @Override