Fix go_router navigation (#1515)

game_template/lib/src/level_selection/level_selection_screen.dart

@@ -61,7 +61,7 @@ class LevelSelectionScreen extends StatelessWidget {
         ),
         rectangularMenuArea: ElevatedButton(
           onPressed: () {
-            GoRouter.of(context).pop();
+            GoRouter.of(context).go('/');
           },
           child: const Text('Back'),
         ),

game_template/lib/src/main_menu/main_menu_screen.dart

@@ -71,7 +71,7 @@ class MainMenuScreen extends StatelessWidget {
               _gap,
             ],
             ElevatedButton(
-              onPressed: () => GoRouter.of(context).go('/settings'),
+              onPressed: () => GoRouter.of(context).push('/settings'),
               child: const Text('Settings'),
             ),
             _gap,

game_template/lib/src/play_session/play_session_screen.dart

@@ -94,7 +94,7 @@ class _PlaySessionScreenState extends State<PlaySessionScreen> {
                       child: SizedBox(
                         width: double.infinity,
                         child: ElevatedButton(
-                          onPressed: () => GoRouter.of(context).pop(),
+                          onPressed: () => GoRouter.of(context).go('/play'),
                           child: const Text('Back'),
                         ),
                       ),

game_template/lib/src/win_game/win_game_screen.dart

@@ -63,7 +63,7 @@ class WinGameScreen extends StatelessWidget {
         ),
         rectangularMenuArea: ElevatedButton(
           onPressed: () {
-            GoRouter.of(context).pop();
+            GoRouter.of(context).go('/play');
           },
           child: const Text('Continue'),
         ),