Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/c159b9cb625a
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #17763 from wilsonpage/bug/988519

Bug 988519 - [Camera] Improve localization

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https://hg.mozilla.org/integration/gaia-central/rev/d0034b344da0
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 988519 - [Camera] Improve localization
Bumping manifests a=b2g-bump