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

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https://hg.mozilla.org/integration/gaia-central/rev/fc8faac21133
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #10350 from punamdahiya/Bug-838179_ShowFiles

Bug-838179 - [Music] - Show files beginning with . in the music app r=davidflanagan

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https://hg.mozilla.org/integration/gaia-central/rev/ec12ffc1b3d1
Author: Punam Dahiya <punamdahiya@yahoo.com>
Desc: Bug-838179 - [Music] - Show files beginning with . in the music app r=davidflanagan