audio/audacity: remove outdated pkg-message

pkg-message was created more than 8 years ago for the then current version 2.1.
Now this information is of no value.

PR:		278807
Approved by:	xxjack12xx@gmail.com (maintainer)

audio/audacity/pkg-message

@@ -1,10 +0,0 @@
-[
-{ type: upgrade
-  maximum_version: 2.1
-  message: <<EOM
-Starting with 2.1, Audacity's settings file format is not 100% compatible
-with previous versions. If Audacity fails to start up, the affected users
-can resolve the issue by removing the ~/.audacity-data directory.
-EOM
-}
-]