Revert "gnome-all: Drop firefox-esr-mobile config"

This reverts commit 81b6b6f5.
3 jobs for firefox-esr in 5 minutes and 23 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Package
passed #323859
librem5
package:deb-debian

00:00:47

 
  Test Package
passed #323860
librem5
autopkgtest-debian-package

00:04:36

passed #323861
librem5
lintian-debian-package

00:00:43