Forum Remove a space from between usernames in Who's Online
 

How would I remove one of the spaces between usernames in my Who's Online display?

It's displaying like this:
user1, user2, user3, user4

I'd like:
user1, user2, user3, user4

Thanks, in advance.

Edit: The post shows no difference. Figures. I don't want two spaces after the commas, I'd like just the one.