Incrementing AAX change counter when audioProcessorChanged is called.

modules/juce_audio_plugin_client/AAX/juce_AAX_Wrapper.cpp

@@ -679,6 +679,7 @@ struct AAXClasses
 
         void audioProcessorChanged (AudioProcessor* processor) override
         {
+            ++mNumPlugInChanges;
             check (Controller()->SetSignalLatency (processor->getLatencySamples()));
         }