default: Update our gerrit URL

Change-Id: I8572f0c0936e74d9bf1511aa1a1588b17e9a51c1

default.xml

@@ -9,7 +9,7 @@
            review="android-review.googlesource.com" />
 
   <remote  name="private"
-           review="build1.dev.xda-developers.com"
+           review="gerrit.omnirom.org"
            fetch="ssh://git@build2.dev.xda-developers.com" />
 
   <remote  name="github"