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

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https://hg.mozilla.org/integration/gaia-central/rev/bc78fbad02de
Author: Ed Morley <emorley@mozilla.com>
Desc: Revert "Bug 988519 - [Camera] Improve localization" for gaia-unit test failures

This reverts commit 5f3874235f25e0cfdcaf3af239f8238b34426461.
Bumping manifests a=b2g-bump