fix: remove deprecated featrue export

Author: nayounsang

packages/msw-dev-tool/src/lib/index.ts

@@ -1,6 +1,5 @@
 import { FlattenHandler } from "./type";
-import { initMSWDevTool, setupDevToolWorker } from "./handlerStore";
+import { setupDevToolWorker } from "./handlerStore";
 
 export { FlattenHandler };
-export { initMSWDevTool };
 export { setupDevToolWorker };