change "op" cap in terminfo entry to xterm/rxvt value.

st.info

@@ -79,7 +79,7 @@ st| simpleterm,
 	mir,
 	msgr,
 	ncv#3,
-	op=\E[37;40m,
+	op=\E[39;49m,
 	pairs#64,
 	rc=\E8,
 	rev=\E[7m,