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

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https://hg.mozilla.org/integration/gaia-central/rev/6002ec46ae01
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #18427 from dmarcos/bug996195

Bug 996195 - [Camera][Madai][UX] Mode Switcher Icons should have the sam...

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https://hg.mozilla.org/integration/gaia-central/rev/1e67a1ba05bb
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Bug 996195 - [Camera][Madai][UX] Mode Switcher Icons should have the same size on both on and off states
Bumping manifests a=b2g-bump