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

========

https://hg.mozilla.org/integration/gaia-central/rev/98fd9bf9c257
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #17918 from dmarcos/bug988632

Bug 988632 - [Camera][Madai] More frequent instances of "Picture not sav...

========

https://hg.mozilla.org/integration/gaia-central/rev/964de2213053
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Bug 988632 - [Camera][Madai] More frequent instances of "Picture not saved" when tapping shutter button
Bumping manifests a=b2g-bump