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

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https://hg.mozilla.org/integration/gaia-central/rev/cd4371f0dd90
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #18033 from KevinGrandon/richierichrawr-patch-2

Bug 992666 - [Bluetooth] fix deviceList.js error message r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/4a0178d738aa
Author: richierichrawr <richierichrawr@users.noreply.github.com>
Desc: Bug 992666 - [Bluetooth] fix deviceList.js error message r=kgrandon

Error message in bt_discoveryStopFailed() clarified to be understandable.
Bumping manifests a=b2g-bump