Fix update check for gpg4win
In gpg4win, Kleopatra has a version number like "3.2.0.231170 (Gpg4win-4.3.0)". The regex extracting the gpg4win version number from this is not expecting a ')' between the version number and the end of the string. This means that matching fails, which causes the update check to be performed with an unexpected parameter.
GnuPG-Bug-ID: 6985