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

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https://hg.mozilla.org/integration/gaia-central/rev/d0ce124154d9
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #13598 from cctuan/936392

Bug 936392 - [Flatfish] Unable to set wallpaper by using photos from gal...

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https://hg.mozilla.org/integration/gaia-central/rev/fcea0b34bd4a
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 936392 - [Flatfish] Unable to set wallpaper by using photos from gallery