x11/gnome-shell-extensions: update to 47.6

Update gnome-shell-extensions to version 47.6.

We don't need USE_LDCONFIG. (truckman)

gettext -> gettext-tools (truckman)

Pet portlint. (truckman)

PR: 287901
MFH: 2025Q3
(cherry picked from commit 59aeab672446fe375ecbbe33d3eda54f670e2fbb)