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

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https://hg.mozilla.org/integration/gaia-central/rev/5d470e57a891
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Revert "Merge pull request #16628 from 6a68/bug-972645-reset-password"

This reverts commit e2427df4eaf5b0b7ae207b256a51436b5b80d769, reversing
changes made to 117b06a09a1e15ce19f21eaaf53a7fe187b233d8.
Bumping manifests a=b2g-bump