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

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https://hg.mozilla.org/integration/gaia-central/rev/dc7a50bca585
Author: Arthur Chen <crh0716@gmail.com>
Desc: Revert "Bug 928851 - Adopt new API of enabling/disabing RIL radio"

This reverts commit 2cd2a529e5f1ab72569886998435bc46e22bf825.