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

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https://hg.mozilla.org/integration/gaia-central/rev/61997ab58454
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Revert "Merge pull request #22282 from mikehenrty/bug-1038988-reland-wallpaper"

This reverts commit d026b492f4b1cf3978c080d713ac71c2cb774c25, reversing
changes made to 5fd14b8bc428f87f9b5cf9cc49f9a4f362a970fb.
Bumping manifests a=b2g-bump