correct an rng mistake in 6e0d55df from Jan 2019

Reported by entrez

src/do_name.c

@@ -1332,7 +1332,7 @@ do_oname(struct obj *obj)
         /* for "the Foo of Bar", only scuff "Foo of Bar" part */
         bufp = !strncmpi(buf, "the ", 4) ? (buf + 4) : buf;
         do {
-            wipeout_text(bufp, rn2_on_display_rng(2), (unsigned) 0);
+            wipeout_text(bufp, rnd_on_display_rng(2), (unsigned) 0);
         } while (!strcmp(buf, bufcpy));
         pline("While engraving, your %s slips.", body_part(HAND));
         display_nhwindow(WIN_MESSAGE, FALSE);