Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/037bc2345d2c
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Merge pull request #11931 from Rik/second-call-871127

Bug 871127 - [dialer] cannot make a second call through dialer r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/f18ffe112788
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Bug 871127 - [dialer] cannot make a second call through dialer

- Refactor the CSS for the icons
- Add a place-new-call button
- Show the dialer toolbar with a smaller height
- New tests for modified functions