Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/5aec7ae12f4a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 967516 - Enable DEVICE_DEBUG by default for non production builds r=ochameau"

This reverts commit ddcc8f22ddaad19203262896738ef8b1b3bca253.
Bumping manifests a=b2g-bump