[KERNEL32][PSDK][NTVDM][CONSRV] Use now-documented ReadConsoleInputEx() flag names.

Addendum to commit b8b8819c7 (r60920)

ReadConsoleInputEx() and its flags used to be undocumented.
In the meantime they became documented on MSDN, see:
https://learn.microsoft.com/en-us/windows/console/readconsoleinputex

We can therefore adopt these now-documented flag names.

subsystems/mvdm/ntvdm/emulator.c

@@ -228,7 +228,7 @@ ConsoleEventThread(LPVOID Parameter)
                                  InputRecords,
                                  ARRAYSIZE(InputRecords),
                                  &NumRecords,
-                                 CONSOLE_READ_CONTINUE))
+                                 CONSOLE_READ_NOWAIT))
         {
             DWORD LastError = GetLastError();
             DPRINT1("Error reading console input (0x%p, %lu) - Error %lu\n", ConsoleInput, NumRecords, LastError);