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

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https://hg.mozilla.org/integration/gaia-2_1/rev/48ffb39f4b9c
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Revert "Merge pull request #25857 from KevinGrandon/bug_1089528_statusbar_closing"

This reverts commit 3fc987680a19be2cbbb069c25e10f24cdda4d0c9, reversing
changes made to db056d03e6b8690e101645acb52584af7728550d.
Bumping manifests a=b2g-bump