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

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https://hg.mozilla.org/integration/gaia-central/rev/e30651ef497c
Author: Ricky Chien <ricky060709@gmail.com>
Desc: Merge pull request #26984 from mozilla-b2g/revert-26957-bug_1112748_dual_home_screens

Revert "Bug 1112748 - Do not install horizontal home screen onto devices r=m2

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https://hg.mozilla.org/integration/gaia-central/rev/be64606018f1
Author: Ricky Chien <ricky060709@gmail.com>
Desc: Revert "Bug 1112748 - Do not install horizontal home screen onto devices +autoland"
Bumping manifests a=b2g-bump