Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/120c9928e015
Author: evelynhung <jj.evelyn@gmail.com>
Desc: Merge pull request #19736 from pivanov/bug-1017027

Bug 1017027 - [Flame][Settings] - Fuzzy images, r=evelyn

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https://hg.mozilla.org/integration/gaia-central/rev/2baf694b1504
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 1017027 - [Flame][Settings] - Fuzzy images
Bumping manifests a=b2g-bump