Bumping gaia.json for 2 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/d82458ac3113
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #13473 from dmarcos/bug931054v1.2

Bug 931054 - [Camera] filmstrip.js tries to access undefined preview met...

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https://hg.mozilla.org/integration/gaia-1_2/rev/e29f5943d947
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Bug 931054 - [Camera] filmstrip.js tries to access undefined preview metadata