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

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https://hg.mozilla.org/integration/gaia-central/rev/87d3e658503b
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #13679 from wilsonpage/Bug937941

Bug 937941 - [Camera] Add missing flash icon and update to high-res icon...

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https://hg.mozilla.org/integration/gaia-central/rev/bd0a9c624464
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 937941 - [Camera] Add missing flash icon and update to high-res icons in HUD