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

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https://hg.mozilla.org/integration/gaia-central/rev/de57cd03d28a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #16974 from KevinGrandon/bug_946852_search_mode

Bug 946852 - [Email] Search Mail field appears twice

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https://hg.mozilla.org/integration/gaia-central/rev/861e94eee5ac
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 946852 - [B2G][Email] Search Mail field appears twice on email search filter page when user reveals drag down search field r=jrburke
Bumping manifests a=b2g-bump