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

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https://hg.mozilla.org/integration/gaia-2_0/rev/7f8d76516bce
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #22536 from justindarc/bug1043705-v2.0

Bug 1043705 - Selecting same resolution twice will make the preview comp...

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https://hg.mozilla.org/integration/gaia-2_0/rev/b7fae8fa2300
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 1043705 - Selecting same resolution twice will make the preview completely blank
Bumping manifests a=b2g-bump