Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/30480ecedda4
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Revert "Merge pull request #24874 from jmcanterafonseca/fix_settings_animation"

This reverts commit 8ac5a26ca1ba5a8aaae7bf45cc80a88c2d2f8daa, reversing
changes made to dff5b849df3f34b3f88dbc37bdd21254e4e5a880.
Bumping manifests a=b2g-bump