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

========

https://hg.mozilla.org/integration/gaia-central/rev/a3b0da8b7871
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #15924 from mcav/original-interface

Bug 961890 - [Sora][Clock][Timer] After unlocking screen, it doesn't stay original interface. r=jugglinmike

========

https://hg.mozilla.org/integration/gaia-central/rev/09be6983aa3d
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 961890 - [Sora][Clock][Timer] After unlocking screen, it doesn't stay original interface when create timer. r=jugglinmike
Bumping manifests a=b2g-bump