refactor: adjust code after upgrade of ionic from v4 to v5

Note: used observables instead of events service which
doesn't exist in ionic 5 anymore.

src/app/modules/settings/settings.module.ts

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018, 2019 StApps
+ * Copyright (C) 2018, 2019, 2020 StApps
  * This program is free software: you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the Free
  * Software Foundation, version 3.
@@ -17,7 +17,7 @@ import {NgModule} from '@angular/core';
 import {FormsModule} from '@angular/forms';
 import {RouterModule, Routes} from '@angular/router';
 import {Geolocation} from '@ionic-native/geolocation/ngx';
-import {Events, IonicModule} from '@ionic/angular';
+import {IonicModule} from '@ionic/angular';
 import {TranslateModule} from '@ngx-translate/core';
 
 import {ConfigProvider} from '../config/config.provider';
@@ -49,7 +49,6 @@ const settingsRoutes: Routes = [
   ],
   providers: [
     ConfigProvider,
-    Events,
     Geolocation,
     SettingsProvider,
   ],