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

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https://hg.mozilla.org/integration/gaia-central/rev/2e4621bcc153
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #14254 from snowmantw/issue945080

Bug 945080 - "White dots" appears above and below the camera icon for 1.5dppx phones

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https://hg.mozilla.org/integration/gaia-central/rev/903f823d1d7e
Author: Greg Weng (snowmantw) <gweng@mozilla.com>
Desc: Bug 945080 - "White dots" appears above and below the camera icon for 1.5dppx phones