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

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https://hg.mozilla.org/integration/gaia-central/rev/04f6f53c3d63
Author: Ben Kelly <bkelly@mozilla.com>
Desc: Merge pull request #12671 from wanderview/system-camera-test

Bug 923702: Do not run camera tests within system app. r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/5dbf1f4c3a1a
Author: Ben Kelly <ben@wanderview.com>
Desc: Bug 923702: Do not run camera tests within system app.