Remove the CORS filter.

I've spent multiple hours trying to figure out why it isn't actually working, and at this point I'm giving up on it. If you want an alternate web UI, send pull requests or run your own servers. My servers will only officially support my UI, though you are free to use other UIs if you can make them work with them (but I provide no guarantees that updates won't break things).

src/main/resources/WEB-INF/web.xml

@@ -17,14 +17,4 @@
     <filter-name>SetCacheControl</filter-name>
     <url-pattern>/*</url-pattern>
   </filter-mapping>
-<!--
-  <filter>
-    <filter-name>CorsFilter</filter-name>
-    <filter-class>org.apache.catalina.filters.CorsFilter</filter-class>
-  </filter>
-  <filter-mapping>
-    <filter-name>CorsFilter</filter-name>
-    <url-pattern>/*</url-pattern>
-  </filter-mapping>
--->
 </web-app>