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

========

https://hg.mozilla.org/integration/gaia-central/rev/ff389f5e64ba
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #24306 from KevinGrandon/bug_971541_systemv2_quick_settings

Bug 971541 - [System2] Instantiable QuickSettings

========

https://hg.mozilla.org/integration/gaia-central/rev/13d9ee162bbf
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 971541 - [System2] Instantiable QuickSettings r=alive
Bumping manifests a=b2g-bump