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

src/options.c

@@ -2559,6 +2559,14 @@ optfn_name(
 
         if ((op = string_for_env_opt(allopt[optidx].name, opts, FALSE))
             != empty_optstr) {
+#ifdef WIN32
+            /*
+             * Under windows, if we already set flags.debug with -D
+             * on the command line, leave that alone.
+             */
+            if (flags.debug && !strcmpi(svp.plname, "wizard"))
+                return optn_ok;
+#endif
             nmcpy(svp.plname, op, PL_NSIZ);
         } else
             return optn_err;

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_-.", '%',