[SHELL32] Fix Control_RunDLL single comma syntax out of range dialog box numbers (reactos#7595)

If an out of range dialog box number was given in a single comma syntax
for Control_RunDLL(), it should be set to 0 to launch the default dialog
box instead of failing. 

Addendum to dcf9eb0. CORE-19580 CORE-8981

Author: TheNNX

dll/win32/shell32/wine/control.c

@@ -1104,7 +1104,7 @@ static	void	Control_DoLaunch(CPanel* panel, HWND hWnd, LPCWSTR wszCmd)
             }
         }
 
-        if (sp >= applet->count && wszDialogBoxName[0] == L'\0')
+        if (sp >= applet->count && (wszDialogBoxName[0] == L'\0' || wszDialogBoxName[0] == L'@'))
         {
             sp = 0;
         }