Remove version from Gerrit site

Change-Id: I5c30fa903350edf026b3e81bbc772d3e96e7ac49

gerrit@3.11.0.rb

diff --git a/gerrit@3.11.0.rb b/gerrit@3.11.0.rb
index ceb730b..ca5264e 100644
--- a/gerrit@3.11.0.rb
+++ b/gerrit@3.11.0.rb
@@ -22,6 +22,6 @@
     (prefix/"plugins").install "plugins/uploadvalidator.jar"
     (prefix/"plugins").install "plugins/avatars-gravatar.jar"
 
-    system "java", "-jar", bin/"gerrit.war", "init", "-d", prefix, "--batch", "--install-all-plugins"
+    system "java", "-jar", bin/"gerrit.war", "init", "-d", (prefix/".."), "--batch", "--install-all-plugins"
   end
 end