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

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https://hg.mozilla.org/integration/gaia-central/rev/aff2354c9d07
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #15399 from alivedise/bugzilla/960406/pref-off-app-transition

Bug 960406 - Immediate App Transition, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/030055cb4fe6
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 960406 - Immediate App Transition