Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/bde58535dcee
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Merge pull request #12647 from teodosia/remove-unused-homescreen-locators

Bug 923457 - Removed unused locators in lockscreen/test_lockscreen_unlock_to_homescreen.py

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https://hg.mozilla.org/integration/gaia-central/rev/e582c7ceb0a8
Author: Teodosia Pop <teodosia.pop@gmail.com>
Desc: Bug 923457 - Removed unused locators in lockscreen/test_lockscreen_unlock_to_homescreen.py