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

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https://hg.mozilla.org/integration/gaia-central/rev/0fd166333772
Author: Ben Kelly <bkelly@mozilla.com>
Desc: Merge pull request #13489 from wanderview/contacts-overlay-hide-list

Bug 936215: Hide contacts list while showing overlay.  r=jmcf

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https://hg.mozilla.org/integration/gaia-central/rev/c6582278679d
Author: Ben Kelly <ben@wanderview.com>
Desc: Bug 936215: Hide contacts list while showing overlay.