Replace accidental CP437 char embedded in XtrnProgLstUnderline string

As reported by mlong

ctrl/text.dat

@@ -462,7 +462,7 @@
 "\r\n\r\nNo external programs available.\r\n"           379 NoXtrnPrograms
 "\1n\1c\1h%s \1n\1cExternal Programs:\r\n\r\n"             380 XtrnProgLstHdr
 "\1n\1cNum \1h\xb3\1n\1c Name                             "       381 XtrnProgLstTitles
-"\1h\xc4\xc4\xc4\xc4\xc4\xc4\xc4\xc4\xc4\xc4\xc4\xc4\xc4\xc4\xc4\xc4"\ 382 XtrnProgLstUnderline
+"\1h\xc4\xc4\xc4\xc4\xc5\xc4\xc4\xc4\xc4\xc4\xc4\xc4\xc4\xc4\xc4\xc4\xc4"\ 382 XtrnProgLstUnderline
 	"\xc4\xc4\xc4\xc4\xc4\xc4\xc4\xc4\xc4\xc4\xc4\xc4\xc4\xc4\xc4"\
 	"\xc4\xc4\xc4\xc4\xc4\xc4 "
 "\1h\1c%3u \xb3 \1n\1c%-32.32s\1h "                        383 XtrnProgLstFmt