Fix server deletion
Fix server deletion

In the IPv6 patch there was a typo in the regular expression
"detecting" IP addresses for the server= query parameter.

Thanks to Boyan Krosnov for noticing the problem.

tklauser/ntppool,punitvara/ntppool,punitvara/ntppool,tklauser/ntppool,tklauser/ntppool,punitvara/ntppool,tklauser/ntppool