fix: remove duplicate code in thunk.ts

src/thunk.ts

@@ -16,7 +16,6 @@ export interface ThunkFn {
 }
 
 function copyToThunk (vnode: VNode, thunk: VNode): void {
-  thunk.elm = vnode.elm;
   (vnode.data as VNodeData).fn = (thunk.data as VNodeData).fn;
   (vnode.data as VNodeData).args = (thunk.data as VNodeData).args;
   thunk.data = vnode.data;