frontend: Fix canvas remove event

frontend/widgets/OBSBasic.hpp

@@ -1124,7 +1124,7 @@ public:
 	const OBS::Canvas &AddCanvas(const std::string &name, obs_video_info *ovi = nullptr, int flags = 0);
 
 public slots:
-	bool RemoveCanvas(obs_canvas_t *canvas);
+	bool RemoveCanvas(OBSCanvas canvas);
 
 	/* -------------------------------------
 	 * MARK: - OBSBasic_SceneItems

frontend/widgets/OBSBasic_Canvases.cpp

@@ -31,7 +31,7 @@ const OBS::Canvas &OBSBasic::AddCanvas(const std::string &name, obs_video_info *
 	return it;
 }
 
-bool OBSBasic::RemoveCanvas(obs_canvas_t *canvas)
+bool OBSBasic::RemoveCanvas(OBSCanvas canvas)
 {
 	if (!canvas)
 		return false;