Bumping gaia.json for 1 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/2437b729e8f2
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Revert "Merge pull request #13946 from timdream/keyboard-pref-off-v1.2"

This reverts commit 7bd5adfa1f201dc7b9cfbc8e555faef0b75b944c, reversing
changes made to 7b24f1d1f167fc40b1e887f4ff3746d383af3c2f.