[all] Issue #592 - Sticky switches: more code rewritten, more flash

saved on 9x stock. Logical Switches Delay and Duration modified on
Taranis and Sky9x

radio/src/audio_arm.cpp

@@ -571,7 +571,7 @@ void AudioQueue::wakeup()
     }
 
     // mix the background context
-    if (!isFunctionActive(FUNC_BACKGND_MUSIC_PAUSE)) {
+    if (!isFunctionActive(FUNCTION_BACKGND_MUSIC_PAUSE)) {
       result = mixAudioContext(backgroundContext, buffer, g_eeGeneral.varioVolume, g_eeGeneral.backgroundVolume, fade);
       if (result > 0) {
         size = max(size, result);