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

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https://hg.mozilla.org/integration/gaia-2_1/rev/4c50caa6db11
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Revert "Merge pull request #24354 from nullaus/bug1064975"

This reverts commit a4c14a9a385af9957c0958667405d186e0c87a66, reversing
changes made to 9e28b533bc4f66bb8c440baacd7d807c50fee646.
Bumping manifests a=b2g-bump