room.d: fix sending ticker removal message for deleted users

When a user is deleted from the db, we can't rely on the db to check
if the user had set a ticker. Always send a ticker removal message
for deleted users instead, even if they didn't have a ticker.

Author: mathiascode

src/server/room.d

@@ -158,9 +158,6 @@ final class Room
 
     void del_ticker(string username)
     {
-        if (get_ticker(username) is null)
-            return;
-
         db.del_ticker(name, username);
 
         scope msg = new SRoomTickerRemove(name, username);