Update win32gui.cpp

Update win32gui.cpp

Resolves various conflicts with selecting custom RAM boards and AutoConfig settings.  Previously, switching between the default, manual configuration, or a custom AutoConfig RAM board would send invalid inputs to the emulator.  Some of these changes will cause a buffer overflow in "autoconf.cpp" crashing WinUAE.  A more thorough filtering of input before entering "autoconf.cpp" may be required.

There is still an outstanding issue where selecting a Z3 RAM board will cause the AutoConfig information to appear as a Z2 board in the drop-down list, which does not affect emulation but appears as a bug in the GUI.  This is not an issue with the GUI, but with the list generation of available RAM boards, which must be fixed elsewhere.