AU: Fixed some missing case warnings in the hosting code

modules/juce_audio_processors/format_types/juce_AudioUnitPluginFormat.mm

@@ -1448,28 +1448,16 @@ public:
                                         || info.unit == kAudioUnitParameterUnit_Boolean);
                         bool isBoolean = info.unit == kAudioUnitParameterUnit_Boolean;
 
-                        String label;
-
-                        switch (info.unit)
+                        auto label = [info] () -> String
                         {
-                            case kAudioUnitParameterUnit_Percent:
-                                label = "%";
-                                break;
-                            case kAudioUnitParameterUnit_Seconds:
-                                label = "s";
-                                break;
-                            case kAudioUnitParameterUnit_Hertz:
-                                label = "Hz";
-                                break;
-                            case kAudioUnitParameterUnit_Decibels:
-                                label = "dB";
-                                break;
-                            case kAudioUnitParameterUnit_Milliseconds:
-                                label = "ms";
-                                break;
-                            default:
-                                break;
-                        }
+                            if (info.unit == kAudioUnitParameterUnit_Percent)       return "%";
+                            if (info.unit == kAudioUnitParameterUnit_Seconds)       return "s";
+                            if (info.unit == kAudioUnitParameterUnit_Hertz)         return "Hz";
+                            if (info.unit == kAudioUnitParameterUnit_Decibels)      return "dB";
+                            if (info.unit == kAudioUnitParameterUnit_Milliseconds)  return "ms";
+
+                            return {};
+                        }();
 
                         auto* parameter = new AUInstanceParameter (*this,
                                                                    ids[i],
@@ -1830,6 +1818,7 @@ private:
 
                 break;
 
+            case kAudioUnitEvent_PropertyChange:
             default:
                 if (event.mArgument.mProperty.mPropertyID == kAudioUnitProperty_ParameterList)
                 {