use better string formatting

Author: tibbi

app/src/main/kotlin/com/simplemobiletools/musicplayer/adapters/TracksAdapter.kt

@@ -207,12 +207,13 @@ class TracksAdapter(
 
     private fun setupView(view: View, track: Track, holder: ViewHolder) {
         view.apply {
+            setupViewBackground(activity)
             track_frame?.isSelected = selectedKeys.contains(track.hashCode())
             track_title.text = if (textToHighlight.isEmpty()) track.title else track.title.highlightTextPart(textToHighlight, properPrimaryColor)
             track_info.text = if (textToHighlight.isEmpty()) {
-                track.artist + " - " + track.album
+                "${track.artist} - ${track.album}"
             } else {
-                ( track.artist + " - " + track.album ).highlightTextPart(textToHighlight, properPrimaryColor)
+                ("${track.artist} - ${track.album}").highlightTextPart(textToHighlight, properPrimaryColor)
             }
             track_drag_handle.beVisibleIf(isPlaylistContent && selectedKeys.isNotEmpty())
             track_drag_handle.applyColorFilter(textColor)