gnucash maint: Drop duplicate 'en_US.UTF-8 UTF-8' from archlinux-test

[Frank H.Ellenberger]

Updated	 via  https://github.com/Gnucash/gnucash/commit/6ccd7741 (commit)
	from  https://github.com/Gnucash/gnucash/commit/022d2b08 (commit)



commit 6ccd7741ca8e6348320b47866caf7d9f1e7dfec2
Author: Frank H. Ellenberger <frank.h.ellenberger at gmail.com>
Date:   Wed Apr 13 02:43:00 2022 +0200

    Drop duplicate 'en_US.UTF-8 UTF-8' from archlinux-test
    
    https://lists.gnucash.org/logs/2022/04/12.html#T19:11:57



Summary of changes:
 util/ci/actions/archlinux-test/Dockerfile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)