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

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https://hg.mozilla.org/integration/gaia-central/rev/c825faf613ce
Author: Ed Morley <emorley@mozilla.com>
Desc: Revert "Bug 1043892 - [LockScreen] Solve the visual regression caused by Bug 1043821, with panel switching refactoring" for test failures

This reverts commit a47e7934f4793d24723d1d340608bd6e0bc1fc8d.
Bumping manifests a=b2g-bump