ID Management: Purge: Make outliner button use recursive purge.

This change the 'Purge' button of the Outliner 'Orphaned' view to use
recursive purge, i.e. it wil not only delete immediately unused IDs (as
listed in the view) anymore, but also all their unused dependencies.

release/scripts/startup/bl_ui/space_outliner.py

@@ -55,7 +55,7 @@ class OUTLINER_HT_header(Header):
             layout.operator("outliner.collection_new", text="", icon='COLLECTION_NEW').nested = True
 
         elif display_mode == 'ORPHAN_DATA':
-            layout.operator("outliner.orphans_purge", text="Purge")
+            layout.operator("outliner.orphans_purge", text="Purge").do_recursive=True
 
         elif space.display_mode == 'DATA_API':
             layout.separator()