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

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https://hg.mozilla.org/integration/gaia-2_1/rev/bae5c187ae54
Author: Fernando Rodriguez Sela <frsela@tid.es>
Desc: Revert "Merge pull request #25607 from mancas/bug1082936_v2.1"

This reverts commit 57401e89cf8dfb7cd6f6b589ed9a3a8974b05c9b, reversing
changes made to a27f0fbfb0e4aeedbf9a518e2409cecf2b7b5970.
Bumping manifests a=b2g-bump