yuzu_tester: Remove unused variable

src/yuzu_tester/config.cpp

@@ -93,7 +93,6 @@ void Config::ReadValues() {
 
     // System
     Settings::values.use_docked_mode = sdl2_config->GetBoolean("System", "use_docked_mode", false);
-    const auto size = sdl2_config->GetInteger("System", "users_size", 0);
 
     Settings::values.current_user = std::clamp<int>(
         sdl2_config->GetInteger("System", "current_user", 0), 0, Service::Account::MAX_USERS - 1);