Fix bug that was causing Page item selection grids to be initialized twice and hence causing grid paging to fail.

templates/page/select_items_grid.mako

@@ -5,9 +5,3 @@ ${javascripts()}
 ${stylesheets()}
 ${render_grid_header( grid, False )}
 ${render_grid_table( grid, show_item_checkboxes=True )}
-
-## Initialize the grid.
-<script type="text/javascript">
-    init_grid_elements();
-    init_grid_controls();
-</script>

templates/tracks/add_tracks.mako

@@ -7,6 +7,7 @@ ${render_grid_header( grid, False )}
 ${render_grid_table( grid, show_item_checkboxes=True )}
 
 ## Initialize the grid.
+## TODO: This may not be necessary -- check when adding tracks is working again.
 <script type="text/javascript">
     init_grid_elements();
     init_grid_controls();