Refresh worm segments when (un)taming

Because newsym() would be called only on the head position of the worm,
if hilite_pet was on, the segments and head of a long worm would have
mismatched highlighting in the immediate aftermath of taming or
untaming.

src/worm.c

@@ -988,4 +988,15 @@ flip_worm_segs_horizontal(struct monst *worm, int minx, int maxx)
     }
 }
 
+void
+redraw_worm(struct monst *worm)
+{
+    struct wseg *curr = wtails[worm->wormno];
+
+    while (curr) {
+        newsym(curr->wx, curr->wy);
+        curr = curr->nseg;
+    }
+}
+
 /*worm.c*/