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

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https://hg.mozilla.org/integration/gaia-central/rev/158e218cc9ec
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #20064 from crh0716/1016219

Bug 1016219 - Call to specific panel function when visibility changes r=eragon

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https://hg.mozilla.org/integration/gaia-central/rev/58cf2e2cd4e1
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 1016219 - Call to specific panel function when visibility changes
Bumping manifests a=b2g-bump