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

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https://hg.mozilla.org/integration/gaia-central/rev/a5c433a2df05
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #10942 from crdlc/bug-892357-master

Bug 892357 - Followup to bug 890454 - [Homescreen] The save-bookmark scr...

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https://hg.mozilla.org/integration/gaia-central/rev/54cf0f6d18f5
Author: crdlc <crdlc@tid.es>
Desc: Bug 892357 - Followup to bug 890454 - [Homescreen] The save-bookmark screen does not work fine when Add to Home Screen button is pressed continuously