Set playlist column widths before populating playlist

Big speed improvment. Loading a 540 line playlist went from 0.445s to
0.264s.

app/playlists.py

@@ -787,6 +787,9 @@ class PlaylistTab(QTableWidget):
         # Clear playlist
         self.setRowCount(0)
 
+        # Set widths
+        self._set_column_widths(session)
+
         # Get played tracks
         played_rows = self._get_played_rows(session)
 
@@ -818,9 +821,6 @@ class PlaylistTab(QTableWidget):
             if row0_item:
                 self.scrollToItem(row0_item, QAbstractItemView.ScrollHint.PositionAtTop)
 
-        # Set widths
-        self._set_column_widths(session)
-
         # Queue up time calculations to take place after UI has
         # updated
         self._update_start_end_times(session)