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

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https://hg.mozilla.org/integration/gaia-central/rev/291b607f32e6
Author: Zac <zcampbell@mozilla.com>
Desc: Revert "Bug 1079211 - [v2.2] Disable test_unlock_to_camera_with_passcode because of Bug 1078270"

This reverts commit 73fc42c81419ddc819782d34acc17be1982f1175.
Bumping manifests a=b2g-bump