Enable subclassing of StandaloneFilterApp

modules/juce_audio_plugin_client/Standalone/juce_StandaloneFilterApp.cpp

@@ -91,10 +91,8 @@ public:
         quit();
     }
 
-private:
+protected:
     ScopedPointer<StandaloneFilterWindow> mainWindow;
 };
 
-START_JUCE_APPLICATION (StandaloneFilterApp);
-
 #endif

modules/juce_audio_plugin_client/juce_audio_plugin_client_Standalone.cpp

@@ -27,3 +27,5 @@
 #endif
 
 #include "Standalone/juce_StandaloneFilterApp.cpp"
+
+START_JUCE_APPLICATION (StandaloneFilterApp);