Revert "fix: reset user bookmark when topic is marked unread"

This reverts commit 9bcd85c2c6.

src/topics/bookmarks.js

@@ -28,10 +28,6 @@ module.exports = function (Topics) {
 		await db.sortedSetAdd(`tid:${tid}:bookmarks`, index, uid);
 	};
 
-	Topics.removeUserBookmark = async (tid, uid) => {
-		await db.sortedSetRemove(`tid:${tid}:bookmarks`, uid);
-	};
-
 	Topics.getTopicBookmarks = async function (tid) {
 		return await db.getSortedSetRangeWithScores(`tid:${tid}:bookmarks`, 0, -1);
 	};

src/topics/unread.js

@@ -378,7 +378,6 @@ module.exports = function (Topics) {
 				[`tid:${tid}:bookmarks`, uid],
 			]),
 			db.sortedSetAdd(`uid:${uid}:tids_unread`, Date.now(), tid),
-			Topics.removeUserBookmark(tid, uid),
 		]);
 	};