Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/19991ffea22b
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #25572 from alivedise/bugzilla/1088391_master/set-orientation-on-callscreen-opening

Bug 1088391 - Set orientation on callscreen opening, r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/afd7df6a5ecf
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 1088391 - Set orientation on callscreen opening
Bumping manifests a=b2g-bump