Summary:
In kgpgOptions::updateWidgets(), I assumed "[0-9A-Fa-F]" had a typo and
replaced the last "F" with "f".

Port QRegExp::exactMatch() with QRegularExpression::anchoredPattern(),
except in KGpgGroupNodePrivate::groupPattern() as the pattern is already
anchored with ^ and $.

Test Plan: make && ctest

Reviewers: dakon

Reviewed By: dakon

Subscribers: kde-utils-devel

Differential Revision: https://phabricator.kde.org/D27177