Windows: don't revert -D on command line

Reported by @youbo0 in GitHub issue #1616

This issue text stated:
"To enter wizard mode, I have a shortcut with -D -u wizard as suggested by
the wiki for Windows players. However, the name is now overridden by a name
in .nethackrc since 5.0, resulting in me not actually entering wizard mode
due to having the wrong name despite using -u wizard. In the previous
version, -u wizard was applying properly regardless."

Closes #1616

sys/windows/windmain.c

@@ -399,8 +399,6 @@ _CrtSetReportFile(_CRT_ASSERT, _CRTDBG_FILE_STDERR);*/
        setting of renameallowed; when False, player_selection()
        won't resent renaming as an option */
     iflags.renameallowed = FALSE;
-    /* Obtain the name of the logged on user and incorporate
-     * it into the name. */
     Sprintf(fnamebuf, "%s", svp.plname);
     (void) fname_encode(
         "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz_-.", '%',