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

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https://hg.mozilla.org/integration/gaia-central/rev/be4a788775b4
Author: Ben Francis <ben@tola.me.uk>
Desc: Merge pull request #11721 from lissyx/bug905831

Bug 905831 - Use correct default configuration r=benfrancis

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https://hg.mozilla.org/integration/gaia-central/rev/068c7697459c
Author: Alexandre Lissy <lissyx+github@lissyx.dyndns.org>
Desc: Bug 905831 - Use correct default configuration

When the user has an unsupported carrier, we use a default search
engine, so we need to pass the callback this configuration. This commits
fixes the issue by passing the callback the search engine configuration
at [DEFAULT_MCC + DEFAULT_MNC] in the 'data' structure, instead of
pasing (DEFAULT_MCC + DEFAULT_MNC) to callback.