regedit: We don't bother unregistering window classes on exit, so remove HexEdit_Unregister().

programs/regedit/hexedit.c

@@ -688,9 +688,3 @@ void HexEdit_Register(void)
 
     RegisterClass(&wndClass);
 }
-
-
-void HexEdit_Unregister(void)
-{
-    UnregisterClass(HEXEDIT_CLASS, NULL);
-}

programs/regedit/main.h

@@ -147,6 +147,5 @@ extern void error(HWND hwnd, INT resId, ...);
 
 /* hexedit.c */
 extern void HexEdit_Register(void);
-extern void HexEdit_Unregister(void);
 
 #endif /* __MAIN_H__ */