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

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https://hg.mozilla.org/integration/gaia-central/rev/db680b3de9af
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #22247 from alivedise/bugzilla/1045520/default-background-is-white

Bug 1045520 - default background is white, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/bccaa4fb1a6b
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 1045520 - default background is white
Bumping manifests a=b2g-bump