Fix userpref.blend using version from startup.blend

Version patching userpref.blend wasn't using the correct version,
causing settings not to be properly updated.

This seems the likely cause of T70196 and similar bugs.

source/blender/editors/include/UI_interface.h

@@ -1752,7 +1752,7 @@ void UI_popup_handlers_remove_all(struct bContext *C, struct ListBase *handlers)
  * be used to reinitialize some internal state if user preferences change. */
 
 void UI_init(void);
-void UI_init_userdef(struct Main *bmain);
+void UI_init_userdef(void);
 void UI_reinit_font(void);
 void UI_exit(void);