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)