Timeline: Change keybinding for track height adjustment.

lib/ntk

@@ -1 +1 @@
-Subproject commit 38275d616800d5af826fd4a9c761a98068e7311a
+Subproject commit 645579913d0bfbfdcc9cd0107dd55bd121a99990

timeline/src/Track.C

@@ -1075,7 +1075,7 @@ Track::handle ( int m )
         {
             Logger log( this );
 
-            if ( ! Fl::event_shift() )
+            if ( ! Fl::event_alt() )
                 return Fl_Group::handle( m );
 
             int d = Fl::event_dy();