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

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https://hg.mozilla.org/integration/gaia-central/rev/688fc3ba0ba2
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #10692 from crdlc/bug-887801

Bug 887801 - [Search UI] the progress and "no contacts found" message are not displayed

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https://hg.mozilla.org/integration/gaia-central/rev/0f63f36b6f7e
Author: crdlc <crdlc@tid.es>
Desc: Bug 887801 - contacts app search \"no contacts found\" message is not displayed