more shop damage repair

Stop attempting to catch up for lost time for shop damage repair
when getlev() loads a previousl visited level.  Normal shopkeeper
behavior will take care of that.

Also, fixes the display related aspects of shop damage repair
interacting with ball and chain.  They don't happen when its done
while the map is being shown.

src/allmain.c

@@ -68,6 +68,7 @@ moveloop_preamble(boolean resuming)
     g.context.botlx = TRUE; /* for STATUS_HILITES */
     if (resuming) { /* restoring old game */
         read_engr_at(u.ux, u.uy); /* subset of pickup() */
+        fix_shop_damage();
     }
 
     (void) encumber_msg(); /* in case they auto-picked up something */