GUI: Try to use std::format

Check to see if it compiles everywhere without issues before using it more widely.

Author: mpiatka

gui/QT/option/audio_opts.cpp

@@ -35,7 +35,7 @@ std::vector<SettingItem> getAudioPlayback(AvailableSettings *availSettings){
 
 	for(const auto &i : availSettings->getDevices(AUDIO_PLAYBACK)){
 		SettingItem item;
-		item.name = i.type + ": " + i.name;
+		item.name = std::format("{}: {}", i.type, i.name);
 		item.opts.push_back({optStr, i.type});
 		item.opts.push_back({optStr + "." + i.type + ".device", i.deviceOpt});
 		auto embedAudioIt = i.extra.find("isEmbeddedAudio");