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

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https://hg.mozilla.org/integration/gaia-central/rev/ff7bc41e4870
Author: Francisco Jordano <fjordano@mozilla.com>
Desc: Revert "Bug 1061411 - [Contacts] ICE 1 & ICE 2 can be set to the same contact"

This reverts commit f1e3a9a8d1e4b6c5066542943e3c043deb0c0aa4.
Bumping manifests a=b2g-bump