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

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https://hg.mozilla.org/integration/gaia-central/rev/2fe023d2c61d
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #13827 from dwi2/bug940236

Bug 940236 - Fix position of slider in display panel r=crh0716

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https://hg.mozilla.org/integration/gaia-central/rev/023692810342
Author: tzhuang <tzhuang@mozilla.com>
Desc: Bug 940236 - Fix position of slider in display panel