Fix for missing save prompt on SC_CLOSE

[levicki]

@davepl

TinyRetroPad/trpad.asm

Line 2190 in 42f4c6c

NotFindMsg:

Fix could go something like this (unoptimized for size of course, feel free to trim):

   NotFindMsg:
        cmp     uMsg, WM_SYSCOMMAND
        jne     NotWMSysCommand
        mov     eax, wParam
        cmp     eax, IDM_SAVE
        je      DoSaveFile
        and     eax, -16
        cmp     eax, SC_CLOSE
        jne     NotWMSysCommand
        mov     uMsg, WM_COMMAND
        mov     wParam, IDM_FILE_EXIT
        jmp     NotWMSysCommand
DoSaveFile:
        call    SaveFile
        xor     eax, eax
        ret

It would fix issues #15 and #24.