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

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https://hg.mozilla.org/integration/gaia-central/rev/e78d7cdd6e73
Author: pacorampas <b.frv@tid.es>
Desc: Merge pull request #20418 from pacorampas/ghost-count-button-dialer-1018494

Bug 1018494 - [B2G][Dialer] On the dialer app screen after the suggestions list is empty, tapping where the result count was, will still opens the overlay menu. r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/124d8d641531
Author: Paco Rampas <pacorampas@gmail.com>
Desc: Bug 1018494 - [B2G][Dialer] On the dialer app screen after the suggestions list is empty, tapping where the result count was, will still opens the overlay menu.
Bumping manifests a=b2g-bump