UI: change behavior for quit prompt

Remove confirmation popup menu, just exit.

Note that this option is mainly for developers or people reviewing
blend files, see D4406 for discussion on reason for keeping this feature
while simplifying how it works.

release/scripts/startup/bl_ui/space_topbar.py

@@ -621,7 +621,7 @@ class TOPBAR_MT_file(Menu):
         layout.separator()
 
         layout.operator_context = 'EXEC_AREA'
-        if bpy.data.is_dirty and context.preferences.view.use_quit_dialog:
+        if bpy.data.is_dirty:
             layout.operator_context = 'INVOKE_SCREEN'  # quit dialog
         layout.operator("wm.quit_blender", text="Quit", icon='QUIT')