gui_sys_patch_start.py: Exit on KDK failure

Nothing to recover from, best to close the app

resources/wx_gui/gui_support.py

@@ -106,6 +106,7 @@ class CheckProperties:
     def __init__(self, global_constants: constants.Constants) -> None:
         self.constants: constants.Constants = global_constants
 
+
     def host_can_build(self):
         """
         Check if host supports building OpenCore configs