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

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https://hg.mozilla.org/integration/gaia-central/rev/38218b466aa1
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #10257 from lightsofapollo/ensure-hours-cleanup-803934

Bug 803934 - Ensure hours cleanup

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https://hg.mozilla.org/integration/gaia-central/rev/ca37a33ec9a8
Author: James Lal <james@lightsofapollo.com>
Desc: Bug 803934 - Actually turn on flag so empty event hours disappear in months day view.