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

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https://hg.mozilla.org/integration/gaia-central/rev/814d50a6110b
Author: KWierso <kwierso@gmail.com>
Desc: Revert "Merge pull request #17023 from pivanov/bug-968483" for gaia-unit test bustage

This reverts commit 32b5a2c8986332d50edde79517fe4fc83ae8519c, reversing
changes made to 6c93da506e79bd7641f2cc0958b531ab84ceefe1.
Bumping manifests a=b2g-bump