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

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https://hg.mozilla.org/integration/gaia-1_3/rev/1ea055cac561
Author: Ben Tian <btian@mozilla.com>
Desc: Merge pull request #16504 from bentian/bug-972142

Bug 972142 - Set camera preview style with CSS pixel values, r=djf, a=1.3+

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https://hg.mozilla.org/integration/gaia-1_3/rev/48578f1db845
Author: Ben Tian <btian@mozilla.com>
Desc: Bug 972142 - Set camera preview style with CSS pixel values.
Bumping manifests a=b2g-bump