config: remove unused param comfort-noise-level from default conference config file (MODAPP-299)

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@14350 d0543943-73ff-0310-b7d9-9358b9ac24b2

conf/autoload_configs/conference.conf.xml

@@ -84,7 +84,6 @@
       <param name="pin-sound" value="conference/conf-pin.wav"/>
       <!-- File to play to when the pin is invalid -->
       <param name="bad-pin-sound" value="conference/conf-bad-pin.wav"/>
-      <param name="comfort-noise-level" value="1400"/>
       <!-- Conference pin -->
       <!--<param name="pin" value="12345"/>-->
       <!-- Default Caller ID Name for outbound calls -->