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

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https://hg.mozilla.org/integration/gaia-central/rev/e1fc74c2ae52
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #18381 from justindarc/bug992393

Bug 992393 - [camera][madai] preview mode UI updates

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https://hg.mozilla.org/integration/gaia-central/rev/26b76bbf1373
Author: verchaswa.sharma <verchaswa.sharma@lge.com>
Desc: Bug 992393 - [camera][madai] preview mode UI updates
Bumping manifests a=b2g-bump