Switch to side-by-side view

--- a/GUI/playlist/GUI_Playlist.cpp
+++ b/GUI/playlist/GUI_Playlist.cpp
@@ -191,7 +191,7 @@
     ui->listView->fill(v_metadata, cur_play_idx);
     _total_msecs = 0;
 
-    int actions = ENTRY_REMOVE | ENTRY_SORT_TNO;
+    int actions = ENTRY_REMOVE | ENTRY_SORT_TNO | ENTRY_INVERT_SELECTION;
 
     ui->listView->set_context_menu_actions(actions);
     ui->listView->set_drag_enabled(true);