core: Remove unnecessary enum casts in log calls

Follows the video core PR. fmt doesn't require casts for enum classes
anymore, so we can remove quite a few casts.

src/core/hle/service/friend/friend.cpp

@@ -229,8 +229,7 @@ private:
             break;
         default:
             // HOS seems not have an error case for an unknown notification
-            LOG_WARNING(Service_ACC, "Unknown notification {:08X}",
-                        static_cast<u32>(notification.notification_type));
+            LOG_WARNING(Service_ACC, "Unknown notification {:08X}", notification.notification_type);
             break;
         }