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

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https://hg.mozilla.org/integration/gaia-central/rev/1446897407a6
Author: Julien Wajsberg <felash@gmail.com>
Desc: Revert "Merge pull request #13769 from timdream/lockscreen-unlock-transition"

This reverts commit 8b3338df8cb0144f2c2826b4b2d5c1841acdd038, reversing
changes made to 28e7dd59cf5b8ad9b197c59fbf92603e934e0474.