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

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https://hg.mozilla.org/integration/gaia-central/rev/849abb6698a7
Author: Ran Ben Aharon <ran@everything.me>
Desc: Merge pull request #11489 from EverythingMe/bugfix-loadmore2

Bug 904085 - Fixed bug from previous related commit r=gregor

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https://hg.mozilla.org/integration/gaia-central/rev/efd145a91578
Author: Ran Ben Aharon <ran@ranbena.com>
Desc: Bug 904085 - Fixed bug from previous related commit r=gregor