Remove duplicate audio bus plugin registry

editor/editor_node.cpp

@@ -6235,7 +6235,6 @@ EditorNode::EditorNode() {
 	add_editor_plugin(memnew(TextureEditorPlugin(this)));
 	add_editor_plugin(memnew(AudioStreamEditorPlugin(this)));
 	add_editor_plugin(memnew(AudioBusesEditorPlugin(audio_bus_editor)));
-	add_editor_plugin(memnew(AudioBusesEditorPlugin(audio_bus_editor)));
 	add_editor_plugin(memnew(SkeletonEditorPlugin(this)));
 	add_editor_plugin(memnew(SkeletonIKEditorPlugin(this)));
 	add_editor_plugin(memnew(PhysicalBonePlugin(this)));