Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/3a80ada106a8
Author: Ed Morley <emorley@mozilla.com>
Desc: Revert "Bug 1019362 - adding a number of gaia ui tests for the first time use app accessibility." for intermittent failures in test_a11y_ftu_desktopb2g.py

This reverts commit b32106f02bebda6546983c2b4b57a78e020abc90.
Bumping manifests a=b2g-bump