Install musescore instead of musescore3

musescore3 is only available in buster-backports, and installing it
before fuss-desktop leads to a situation with broken dependencies, so
it's not safe to install it automatically.

debian/changelog

+fuss-software (10.0.3) unstable; urgency=medium
+
+  * Install musescore instead of musescore3
+
+ -- Elena Grandi <elena@truelite.it>  Tue, 24 Mar 2020 13:29:42 +0100
+
 fuss-software (10.0.2) unstable; urgency=medium
 
   * Added reference to generic wallpaper which is always a copy of the latest one.

metapackages/multimedia

@@ -24,7 +24,7 @@ libxine2-misc-plugins
 libxine2-plugins
 mplayer
 mpv
-musescore3
+musescore
 obs-studio
 openshot
 recordmydesktop