In the systemd unit upstream the betterlockscreen binary path is
hardcoded to /usr/local .
This commit adds a patch that corrects that path to the one where
betterlocksreen is installed by the ebuild.
Package-Manager: Portage-3.0.28, Repoman-3.0.3
Signed-off-by: Vladimir Timofeenko <id@vtimofeenko.com>