FS-7703 remove answer delay from default dp

conf/vanilla/vars.xml

@@ -439,7 +439,6 @@
   <!-- Enable liberal DTMF for those that can't get it right -->
   <X-PRE-PROCESS cmd="set" data="rtp_liberal_dtmf=true"/>
   <!-- Helps with WebRTC Audio -->
-  <X-PRE-PROCESS cmd="set" data="answer_delay=4000"/>
 
   <!-- Stock Video Avatars -->
   <X-PRE-PROCESS cmd="set" data="video_mute_png=$${images_dir}/default-mute.png"/>