Fix B03001

"You can't loot or pick up containers on the floor if you're not
skilled enough to reach them from your saddle, but you can check
for and disarm traps on them; this seems a little odd. (Likewise,
being able to set land mines and beartraps while riding.)"

src/trap.c

@@ -3392,7 +3392,13 @@ boolean force;
 			case 'q': return(0);
 			case 'n': continue;
 		    }
-
+#ifdef STEED
+		    if (u.usteed && P_SKILL(P_RIDING) < P_BASIC) {
+			You("aren't skilled enough to reach from %s.",
+				mon_nam(u.usteed));
+			return(0);
+		    }
+#endif
 		    if((otmp->otrapped && (force || (!confused
 				&& rn2(MAXULEV + 1 - u.ulevel) < 10)))
 		       || (!force && confused && !rn2(3))) {