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

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https://hg.mozilla.org/integration/gaia-central/rev/6e22b74b2659
Author: gitmai <mri@tid.es>
Desc: Merge pull request #18979 from gitmai/bug-1006348-app-mantain-previous-view

Bug 1006348 -[Cost control] After minimizing the app with the settings s...

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https://hg.mozilla.org/integration/gaia-central/rev/70a74ecaec07
Author: mai <mri@tid.es>
Desc: Bug 1006348 -[Cost control] After minimizing the app with the settings screen opened, this view is closed when the app is relaunched
Bumping manifests a=b2g-bump