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

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https://hg.mozilla.org/integration/gaia-2_0/rev/4ce18bccde3b
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Bug 1014706 - Hide the accept button when in SI/SL mode r=julienw

(cherry picked from commit 9634534545d4c17f7265029191a32afc662fcca0)
Bumping manifests a=b2g-bump