Bumping gaia.json for 1 gaia-central revision(s)

========

https://hg.mozilla.org/integration/gaia-central/rev/dfacedfab904
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Revert "Bug 883787 - Translate the code in HTML comments in the build process"

This reverts commit 53eea8a3da5ae1de3de471a0b1d48aafdd7e81ce.

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "22af4c7c180116ba085a1747b1d310f017adb4e6", 
+    "revision": "dfacedfab9048c0b0e7235aa4d8a19714d5a8d54", 
     "repo_path": "/integration/gaia-central"
 }