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

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https://hg.mozilla.org/integration/gaia-central/rev/045f9ed29f81
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #12483 from snowmantw/issue919854

Bug 919854 - [LockScreen] The icon effects isn't obvious enough

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https://hg.mozilla.org/integration/gaia-central/rev/4b035f2dbbf6
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 919854 - [LockScreen] The icon effects isn't obvious enough