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

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https://hg.mozilla.org/integration/gaia-2_1/rev/0bc246dbd0e5
Author: Greg Weng <snowmantw@gmail.com>
Desc: Revert "Revert "Bug 1069879 - Only three dots shown when entering passcode""

This reverts commit e3e6d3aded753bebcfcce185bd3a2b1d2f5b5104.

This commit remove the previous testing reverting commit which is
landed incorrectly, and let the approval+ and review+ patch land in v2.1.
Bumping manifests a=b2g-bump