Unified wallpaper path for openSUSE and SLES

[lkocman]

Hello

in order to unify branding paths on SLES and openSUSE I would like to use /usr/share/default instead of openSUSEdefault and SLEdefault options for wallpapers.

Ideally these would have then /usr/share/wallpaper/default.png respectively default-dark.png symlinks to /usr/share/wallpapers/default/*/default.png etc.

for SLES dark could be a symlink to default in case of missing dark variant. Leap and TW have both as of today.

We started this unification effort as part of #152 which was relevant https://news.opensuse.org/2024/04/09/common-wallpaper-path/ . We've then introduced single 4096x4096px wallpaper in #160 and #154 for Leap and Tumbleweed.

I consider the /usr/share/default as and implementation of https://jira.suse.com/browse/PED-11079 on SLES side (ask to use single 4096x4096px with default.png and optionally default-dark.png) as an ideal end result.

[lkocman]

@hellcp would you agree?

[hellcp]

/usr/share/default seems like a mirror of /etc/default, how about /usr/share/branding to follow the package naming scheme?

[My2ndAngelic]

I would like to suggest also a folder for old tumbleweed wallpapers, perhaps in the gos package, or maybe in /usr/share/branding/legacy