editproj.cgi: actually initiate a restart when selected
Since
dcad805d mirrorproj.cgi no longer initiates a clone.
Not only does this avoid duplicate clone requests since regproj.cgi
has been initiating clones since
6a6d238a, but it avoids possible
malicious behavior since mirrorproj.cgi does not require a password.
However, this change leaves mirrors that need to be restarted
unable to be restarted since $proj->clone never gets called.
Add the necessary $proj->clone call to editproj.cgi instead so
that mirrors can actually be restarted.