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

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https://hg.mozilla.org/integration/gaia-central/rev/b1322793e563
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Revert "Bug 959344 - Disable test_settings_gps.py due to intermittency a=testonly"

This reverts commit 760848768b78ad3d94694b969b54c1426da7f16e.
Bumping manifests a=b2g-bump