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

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https://hg.mozilla.org/integration/gaia-2_0/rev/078998d1f955
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #21679 from snowmantw/issue1037027-2.0

Bug 1037027 - [Lockscreen] notifications can overlap the date on the loc...

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https://hg.mozilla.org/integration/gaia-2_0/rev/10662c3a1af5
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 1037027 - [Lockscreen] notifications can overlap the date on the lockscreen
Bumping manifests a=b2g-bump