Fix bug from roomuserid_knockedcount vs. roomid_knockedcount.

The use of "count" instead of "sequence" leads to confusion with
i.e. counting the elements of a set e.g. Iterator::count().

Signed-off-by: Jason Volk <jason@zemos.net>

src/service/rooms/state_cache/update.rs

@@ -198,7 +198,7 @@ pub async fn update_joined_count(&self, room_id: &RoomId) {
 		.roomid_invitedcount
 		.raw_put(room_id, invitedcount);
 	self.db
-		.roomuserid_knockedcount
+		.roomid_knockedcount
 		.raw_put(room_id, knockedcount);
 
 	self.room_servers(room_id)