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.

(cherry picked from commit 1ba561ebca006b7c2bec1b2d13389d931144debb)

• GnuPG-Bug-ID: T6985