add disabling of sorting where appropriate

ui/browsing/playlistspage.go

@@ -290,6 +290,7 @@ func (p *PlaylistList) buildHeader() {
 		{"Description", false, false},
 		{"Owner", false, false},
 		{"Track Count", true, false}}, p.columnsLayout)
+	p.header.DisableSorting = true
 
 }
 

ui/browsing/trackspage.go

@@ -44,6 +44,7 @@ func NewTracksPage(contr *controller.Controller, conf *backend.TracksPageConfig,
 	t.ExtendBaseWidget(t)
 
 	t.tracklist = widgets.NewTracklist(nil)
+	t.tracklist.DisableSorting = true
 	t.tracklist.AutoNumber = true
 	t.tracklist.SetVisibleColumns(conf.TracklistColumns)
 	t.tracklist.OnVisibleColumnsChanged = func(cols []string) {