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

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https://hg.mozilla.org/integration/gaia-central/rev/5fb34df8d520
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 990537 - [DSDS] Messaging. Apply Visual Refresh to DSDS scenarios r=schung

* use :before instead of :after so that we re not affected by building blocks
* add the sim indication back
* use the correct style for the sim indication
* move the dsds CSS to composer.css
* correctly center the counter and MMS indicators
Bumping manifests a=b2g-bump