Added a missing plug-in capability when creating the AudioPluginDemo project

extras/Projucer/Source/Utility/PIPs/jucer_PIPGenerator.cpp

@@ -584,9 +584,12 @@ StringArray PIPGenerator::getPluginCharacteristics() const
     auto name = metadata[Ids::name].toString();
 
     if (name == "AudioPluginDemo")
-        return { Ids::pluginWantsMidiIn.toString(), Ids::pluginEditorRequiresKeys.toString() };
+        return { Ids::pluginWantsMidiIn.toString(),
+                 Ids::pluginProducesMidiOut.toString(),
+                 Ids::pluginEditorRequiresKeys.toString() };
     else if (name == "AUv3SynthPlugin" || name == "MultiOutSynthPlugin")
-        return { Ids::pluginWantsMidiIn.toString(), Ids::pluginIsSynth.toString() };
+        return { Ids::pluginWantsMidiIn.toString(),
+                 Ids::pluginIsSynth.toString() };
     else if (name == "ArpeggiatorPlugin")
         return { Ids::pluginIsMidiEffectPlugin.toString() };