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

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https://hg.mozilla.org/integration/gaia-1_3/rev/1a1cfccb8243
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Revert "Merge pull request #17991 from bobsilverberg/power_button"

This reverts commit 86301a24e8a9bf7153b58be597323dc92bca9b99, reversing
changes made to 76e87fb7c2aa4ae4311b92ddab3e3fd484f28094.
Bumping manifests a=b2g-bump