MOBILE-3026 core: Fix plugin_not_installed error in iOS

src/app/app.component.ts

@@ -110,6 +110,7 @@ export class MoodleMobileApp implements OnInit {
             this.loginHelper.sitePolicyNotAgreed(data.siteId);
         });
 
+        this.platform.ready().then(() => {
             // Refresh online status when changes.
             this.network.onchange().subscribe(() => {
                 // Execute the callback in the Angular zone, so change detection doesn't stop working.
@@ -125,6 +126,7 @@ export class MoodleMobileApp implements OnInit {
                     }
                 });
             });
+        });
 
         // Check URLs loaded in any InAppBrowser.
         this.eventsProvider.on(CoreEventsProvider.IAB_LOAD_START, (event) => {