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

========

https://hg.mozilla.org/integration/gaia-central/rev/c159b9cb625a
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #17763 from wilsonpage/bug/988519

Bug 988519 - [Camera] Improve localization

========

https://hg.mozilla.org/integration/gaia-central/rev/d0034b344da0
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 988519 - [Camera] Improve localization

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "cfc7e5e99c2cc4e32af326310d90f85faa060306", 
+    "revision": "c159b9cb625a90109a032364ba54e101787e4adb", 
     "repo_path": "/integration/gaia-central"
 }