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It's superceded by Stackdriver Trace.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/common/default/WEB-INF/web.xml

@@ -165,5 +165,4 @@
     <filter-name>OfyFilter</filter-name>
     <url-pattern>/*</url-pattern>
   </filter-mapping>
-
 </web-app>