AU: Set plug-in host callbacks immediately after calling releaseResources() in prepareToPlay() in case the audio unit relies on them during initialisation

modules/juce_audio_processors/format_types/juce_AudioUnitPluginFormat.mm

@@ -913,6 +913,7 @@ public:
         if (audioUnit != nullptr)
         {
             releaseResources();
+            setPluginCallbacks();
 
             for (int dir = 0; dir < 2; ++dir)
             {
@@ -996,8 +997,6 @@ public:
                 if (! haveParameterList)
                     refreshParameterList();
 
-                setPluginCallbacks();
-
                 if (! syncBusLayouts (getBusesLayout(), true, ignore))
                 {
                     prepared = false;