fix endpoint for regenerating VAPID key

app.py

@@ -35,6 +35,7 @@ class WebPushService():
 
         # Setting the application instance        
         self.app = app
+        self.app.add_url_rule('/web-push/regenerate_vapid', view_func=self.regenerate_vapid, methods=['POST'])
 
         # Setting the database URI for the application
         db_uri = os.getenv('SQLALCHEMY_DATABASE_URI', 'sqlite:////app/instance/data/webpush.db')
@@ -194,9 +195,7 @@ class WebPushService():
             time.sleep(24 * 60 * 60)
 
 
-    @staticmethod
-    @app.route('/web-push/regenerate_vapid', methods=['POST'])
-    def regenerate_vapid() -> Tuple[str, int]:
+    def regenerate_vapid(self) -> Tuple[str, int]:
         """
         Endpoint to regenerate VAPID keys.