Add break statement in default case

According to the contributing page (https://github.com/yuzu-emu/yuzu/wiki/Contributing) the default cases should have a break statement

src/yuzu_cmd/yuzu.cpp

@@ -351,6 +351,7 @@ int main(int argc, char** argv) {
                          "additional help.\n\nError Code: {:04X}-{:04X}\nError Description: {}",
                          loader_id, error_id, static_cast<Loader::ResultStatus>(error_id));
         }
+        break;
     }
 
     system.TelemetrySession().AddField(Common::Telemetry::FieldType::App, "Frontend", "SDL");