fix: bad channel.thread handling

src/helpers/channels/threads/unarchive_thread.ts

@@ -1,6 +1,6 @@
-import { editChannel } from "../edit_channel.ts";
+import { editThread } from "./edit_thread.ts";
 
 /** Sets a thread channel to be unarchived. */
 export function unarchiveThread(threadId: bigint) {
-  return editChannel(threadId, { archived: false });
+  return editThread(threadId, { archived: false });
 }