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

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https://hg.mozilla.org/integration/gaia-central/rev/dba2f08117e2
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #21216 from oklang/master

Bug 1030110 - Make the shutdown animation fill the display height

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https://hg.mozilla.org/integration/gaia-central/rev/98df3839372d
Author: Olle Klang <olle.klang@sonymobile.com>
Desc: Bug 1030110 - Make the shutdown animation fill the display height

Using percentage instead of rem for positioning the rings and vh/vw
for sizeing to make them spread out and rezise over any screen size.
Bumping manifests a=b2g-bump