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

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https://hg.mozilla.org/integration/gaia-central/rev/32b72f5b6b07
Author: Greg Weng <snowmantw@gmail.com>
Desc: Revert "Merge pull request #17835 from snowmantw/issue937442-lockscreen-window"

This reverts commit f9a44b5e3cbea1e48b12716aceb0e365fec9e18e, reversing
changes made to abdabccec260237674e6503e55e10623124a69cc.
Bumping manifests a=b2g-bump