Remove ECatcher from GAE code

It's superceded by Stackdriver Trace.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=145440930

java/google/registry/env/alpha/default/WEB-INF/cron.xml

@@ -185,6 +185,4 @@
     <schedule>every 15 minutes</schedule>
     <target>backend</target>
   </cron>
-
-
 </cronentries>