CC-2236: Overbooked shows do not respect default fade time

-once a release we manage to break fades :) fixed.

python_apps/pypo/liquidsoap_scripts/ls_lib.liq

@@ -27,7 +27,7 @@ def append_title(m) =
   end
 end
 
-def crossfade(s)
+def crossfade_airtime(s)
   #duration is automatically overwritten by metadata fields passed in
   #with audio
   s = fade.in(type="log", duration=0., s)

python_apps/pypo/liquidsoap_scripts/ls_script.liq

@@ -44,9 +44,9 @@ web_stream = on_metadata(notify_stream, web_stream)
 output.dummy(fallible=true, web_stream)
 
 queue = on_metadata(notify, queue)
-queue = map_metadata(update=false, append_title, queue)
+queue = map_metadata(update=true, append_title, queue)
 # the crossfade function controls fade in/out
-queue = crossfade(queue)
+queue = crossfade_airtime(queue)
 output.dummy(fallible=true, queue)