Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/f7bb5e97b6d6
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #20515 from dchunwong/fixgalcrop

Bug 1022618- Adjust current_scale in fullscreen_image.py to return a list of numbers rather than a string.

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https://hg.mozilla.org/integration/gaia-central/rev/33bf949d1da0
Author: Dylan Chun Wong <d.chunwong@gmail.com>
Desc: Adjust current_scale in fullscreen_image.py to return a list of the scale x, y rather than a string

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https://hg.mozilla.org/integration/gaia-central/rev/c4bad0c38477
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Bug 1014706 - Hide the accept button when in SI/SL mode r=julienw
Bumping manifests a=b2g-bump