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

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https://hg.mozilla.org/integration/gaia-central/rev/b5845207798b
Author: Yura Zenevich <yura.zenevich@gmail.com>
Desc: Merge pull request #25139 from yzen/bug-1081319

Bug 1081319 - fixing statusbar icons wrapper visibility in full screen a...

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https://hg.mozilla.org/integration/gaia-central/rev/70c20e8b35e0
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1081319 - fixing statusbar icons wrapper visibility in full screen app mode. r=mhenretty
Bumping manifests a=b2g-bump