UI: Use selected text theme of list item for tree view

If view items button is active, call `ui_layout_list_set_labels_active` to
set the `SELECT` flag on label button. Due to this flag being set, text_sel theme
color is copied to `wcol.text` (see `UI_SELECT` condition in `widget_state()`).
This `wcol.text` is later used inside `widget_draw_text()` for text color.

Pull Request: https://projects.blender.org/blender/blender/pulls/140330

source/blender/editors/interface/views/tree_view.cc

@@ -932,6 +932,9 @@ void TreeViewLayoutBuilder::build_row(AbstractTreeViewItem &item) const
   }
   else {
     item.build_row(*row);
+    if (item.is_active_) {
+      ui_layout_list_set_labels_active(row);
+    }
   }
 
   uiLayoutListItemAddPadding(row);