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

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https://hg.mozilla.org/integration/gaia-1_3/rev/a9d9f0164609
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #17722 from julienw/987445-v1.3-remove-vertical-align-middle-for-icon-buttons

Bug 987445 - [B2G][SMS]Delete button behavior intermittently unexpected ...

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https://hg.mozilla.org/integration/gaia-1_3/rev/c1809778f853
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 987445 - [B2G][SMS]Delete button behavior intermittently unexpected when no conversations are selected r=arnau

This removes the 'vertical-align: middle' property for icon buttons.
Bumping manifests a=b2g-bump