Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_0/rev/4422add819f3
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Revert "Merge pull request #22282 from mikehenrty/bug-1038988-reland-wallpaper"

This reverts commit 6b967ae73dd7fdeb08520d153fa33b7ac2bc9f80.
Bumping manifests a=b2g-bump