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

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https://hg.mozilla.org/integration/gaia-central/rev/ba76cfc9b8ee
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #10995 from crh0716/886245

Bug 886245 - Ignore calls to openCallScreen when it is already executing r=etienne, a=leo+

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https://hg.mozilla.org/integration/gaia-central/rev/12c412966211
Author: crh0716 <crh0716@gmail.com>
Desc: Bug 886245 - Ignore calls to openCallScreen when it is already executing