feedback-manager: Search for default theme under XDG_CONFIG_HOME first

This would allow users to create their own feedback profiles
without editing system files or using root privileges

Signed-off-by: Pablo Correa Gómez <ablocorrea@hotmail.com>
8 jobs for master in 17 minutes and 12 seconds (queued for 39 minutes and 10 seconds)
Status Job ID Name Coverage
  Build
passed #352682
librem5
build:native-debian-bullseye

00:01:44

passed #352680
librem5
build:native-debian-buster:full

00:01:37

passed #352681
librem5
build:native-debian-buster:lib

00:01:28

 
  Test
passed #352683
librem5
test:native-debian-bullseye

00:01:37

62.6%
 
  Package
passed #352684
librem5
package:deb-debian-buster

00:02:51

passed #352685
librem5:arm64
package:deb-debian-buster:arm64

00:05:22

 
  Test Package
passed #352686
librem5
autopkgtest-debian-buster-package

00:02:04

passed #352687
librem5
lintian-debian-buster-package

00:01:55