Fix a few nits from recent PR.

bemani/data/triggers.py

@@ -21,6 +21,7 @@ class Triggers:
             GameConstants.DDR: 'Dance Dance Revolution',
             GameConstants.IIDX: 'Beatmania IIDX',
             GameConstants.JUBEAT: 'Jubeat',
+            GameConstants.MGA: 'Metal Gear Arcade',
             GameConstants.MUSECA: 'MÚSECA',
             GameConstants.POPN_MUSIC: 'Pop\'n Music',
             GameConstants.REFLEC_BEAT: 'Reflec Beat',

bemani/frontend/app.py

@@ -360,7 +360,7 @@ def navigation() -> Dict[str, Any]:
                 'label': 'Metal Gear Arcade',
                 'entries': mga_entries,
                 'base_uri': app.blueprints['mga_pages'].url_prefix,
-                'gamecode': GameConstants.MGA,
+                'gamecode': GameConstants.MGA.value,
             },
         )
 

bemani/frontend/mga/endpoints.py

@@ -15,7 +15,7 @@ from bemani.frontend.types import g
 mga_pages = Blueprint(
     'mga_pages',
     __name__,
-    url_prefix='/mga',
+    url_prefix=f'/{GameConstants.MGA.value}',
     template_folder=templates_location,
     static_folder=static_location,
 )