Update detection of guest clients

[nerzhul]

note sure it's a good enhancement this could match nrz255 for example

[sfan5]

It won't, it only matches if the first letter is uppercase.

[est31]

So when I read that correctly, players with the name Celeron55 will still be counted, as they only have two digits?

[sfan5]

No, only players with:

• first char is uppercase letter
• all following chars are lowercase letters
• 3 or 4 numbers at the end

Edit: I have looked at the active player names while writing the regex and it didn't match any name that didn't look like a guest client name to me.

[est31]

Nice

[sfan5]

(I already have this applied in production anyway)