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

========

https://hg.mozilla.org/integration/gaia-central/rev/691ab18d63ff
Author: Salvador de la Puente González <salva@unoyunodiez.com>
Desc: Merge pull request #14176 from flodolo/fix_wifi

Bug 944371 - [Cost Control] Use "Wi-Fi" consistently in strings instead of "wifi"
r=me

========

https://hg.mozilla.org/integration/gaia-central/rev/244f5505a8e1
Author: Francesco Lodolo (:flod) <flod@lodolo.net>
Desc: Bug 944371 - [Cost Control] Use "Wi-Fi" consistently in strings instead of "wifi"

No need to change IDs, it's just fixing consistency in en-US