Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/ae596668c4a7
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #25793 from huchengtw-moz/bug-1093436-tv-shared

Bug 1093436 - [Stingray][Home] move libraries to tv-shared folder, r=dwi2

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https://hg.mozilla.org/integration/gaia-central/rev/68bd4c64cead
Author: John Hu <johu@mozilla.com>
Desc: Bug 1093436 - [Stingray][Home] move libraries to tv-shared folder

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https://hg.mozilla.org/integration/gaia-central/rev/44c0d45a2f91
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #25051 from lanahuong/Bug_998428

Bug 998428 - Start button should be disabled when the Timer time-picker is set to 0:00. r=mcav

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https://hg.mozilla.org/integration/gaia-central/rev/3f5d6a215988
Author: Lana Scravaglieri <lana.scravaglieri@gmail.com>
Desc: Bug 998428 - Start button should be disabled when the Timer time-picker is set to 0:00
Bumping manifests a=b2g-bump