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.

Co-Authored-By: LC <712067+lioncash@users.noreply.github.com>

src/core/frontend/applets/swkbd.cpp

@@ -87,7 +87,7 @@ ValidationError SoftwareKeyboard::ValidateInput(const std::string& input) const
     default:
         // TODO(jroweboy): What does hardware do in this case?
         LOG_CRITICAL(Frontend, "Application requested unknown validation method. Method: {}",
-                     static_cast<u32>(config.accept_mode));
+                     config.accept_mode);
         UNREACHABLE();
     }