Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/dd302fe529a4
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 972666 - [Calendar] lines over events longer than 2 hours"

This reverts commit b7271eda0061be6e2dd223392b519dfb45157512.

Conflicts:
	apps/calendar/style/week_view.css

Reverting due to intermittent failing marionette test.
Bumping manifests a=b2g-bump