x11/xkeyboard-config: Update to 2.41

Version 2.41 now ships with the temporary patch introduced in
e6f66fef02554459d756c1510fc74a52de40f049 ("x11/xkeyboard-config: Update
to 2.40").

Reviewed by: manu
Differential Revision: https://reviews.freebsd.org/D43749