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

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https://hg.mozilla.org/integration/gaia-central/rev/9a50d134fe46
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #24501 from KevinGrandon/bug_1005921_callscreen_fixes

Bug 1005921 - Callscreen jshint fixes

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https://hg.mozilla.org/integration/gaia-central/rev/c64478b51d45
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1005921 - Callscreen jshint fixes r=rik
Bumping manifests a=b2g-bump