Bumping gaia.json for 3 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/e786bba7f6dd
Author: Evyatar Amitay <evyatron@gmail.com>
Desc: Merge pull request #14178 from EverythingMe/944030-icons-quality

[Bug 944030] Prevent icons double resizing - prevent blur [r=amirn]

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https://hg.mozilla.org/integration/gaia-central/rev/e600991b86be
Author: Evyatar Amitay <evyatron@gmail.com>
Desc: [Bug 944030] Prevent icons double resizing - prevent blur [r=amirn]

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https://hg.mozilla.org/integration/gaia-central/rev/94989fc2a90f
Author: mpizza <mmm198219@gmail.com>
Desc: Revert "Merge pull request #14160 from mpizza/Bug_941567"

This reverts commit 4f64f6b26f2d068126bb3cf0ff1b8404a71bbcf2, reversing
changes made to 256c2ac4a5e587d6d2afa0c51dcb70d6d11705bb.

find regression in this patch, backout first.