Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/a1be19730d96
Author: evanxd <itoyxd@gmail.com>
Desc: Merge pull request #12886 from evanxd/bug-918998

Bug 918998 - [1.2][email] Grouped notifications should not show email address when only one email account is configured.

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https://hg.mozilla.org/integration/gaia-central/rev/fb5f9b859198
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 918998 - Hide email info in notification bar when there is only one configured account. Show email info when there are one more accounts.