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

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https://hg.mozilla.org/integration/gaia-central/rev/16e1bcb1ef74
Author: Ed Morley <emorley@mozilla.com>
Desc: Revert "Bug 1054135 - [B2G][System] support 24 hour time format for Time picker" for JS exceptions

This reverts commit e2497c1445af5fa46d8b1aa9d3228ac68b0795b5.
Bumping manifests a=b2g-bump