Enable Android TV 'OK' Button (#281)

lib/main.dart

@@ -22,7 +22,7 @@ import 'package:easy_localization/src/easy_localization_controller.dart';
 // ignore: implementation_imports
 import 'package:easy_localization/src/localization.dart';
 
-const String currentVersion = '0.13.25';
+const String currentVersion = '0.13.26';
 const String currentReleaseTag =
     'v$currentVersion-beta'; // KEEP THIS IN SYNC WITH GITHUB RELEASES
 
@@ -299,7 +299,9 @@ class _ObtainiumState extends State<Obtainium> {
                   ? lightColorScheme
                   : darkColorScheme,
               fontFamily: 'Metropolis'),
-          home: const HomePage());
+          home: Shortcuts(shortcuts: <LogicalKeySet, Intent>{
+            LogicalKeySet(LogicalKeyboardKey.select): const ActivateIntent(),
+          }, child: const HomePage()));
     });
   }
 }

lib/providers/apps_provider.dart

@@ -344,7 +344,7 @@ class AppsProvider with ChangeNotifier {
       // If we did not install the app (or it isn't installed), silent install is not possible
       return false;
     }
-    var targetSDK;
+    int? targetSDK;
     try {
       targetSDK = (await pm.getPackageInfo(packageName: app.id))
           ?.applicationInfo