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

========

https://hg.mozilla.org/integration/gaia-central/rev/de71fa3f7ac4
Author: Francisco Borja Salguero Castellano <fbsc@tid.es>
Desc: Merge pull request #10941 from julienw/890460-fixedheader-followup

Bug 890460 - [SMS] After deleting all the messages in particular thread,...

========

https://hg.mozilla.org/integration/gaia-central/rev/cfd7cefd6d22
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 890460 - [SMS] After deleting all the messages in particular thread,the 'TODAY' bar still exists in thread_list r=borja

Ensure FixedHeader.refresh is called when rendering an empty screen