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

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https://hg.mozilla.org/integration/gaia-central/rev/bf4b2004954a
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Revert "Merge pull request #13000 from EragonJ/bug-927724"

This reverts commit 4d74b13f20f12996d41eb3e9a6c8775dd1717d67, reversing
changes made to 1433717c81d5f6f439cadf8511f559f1f19f5fc4.

Cause: the dialer is completely broken if your sim doesn't have
voicemail infos.