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

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https://hg.mozilla.org/integration/gaia-central/rev/cfade73d826f
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #13260 from zacc/bug_932385

Bug 932385 - Calling moztelephony.active is hanging the device, try UI l...

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https://hg.mozilla.org/integration/gaia-central/rev/dd328244837f
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 932385 - Calling moztelephony.active is hanging the device, try UI level solution instead