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

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https://hg.mozilla.org/integration/gaia-1_3/rev/689e8e876dc4
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #16646 from alivedise/bugzilla/975368/homescreen-is-not-activated

Bug 975368 - reopen homescreen while it is killed at foreground. r=timdream

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https://hg.mozilla.org/integration/gaia-1_3/rev/2f9f6bf952d3
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 975368 - reopen homescreen while it is killed at foreground.
Bumping manifests a=b2g-bump