fix shop automatic annotation for #overview

[PR #1243.  Cherry picked with new commit log message.  PatR]

Fixes issue where room_discovered was never called for shops
unless #overview was called while inside the shop, fixes #1241.

Issue #1241 reported by mark-mcknight-oncorps.

Triggered by commit e4026d55fb
last December:  Lazy evaluation of overview info.

Closes #1243
Closes #1241

src/hack.c

@@ -3466,7 +3466,7 @@ check_special_room(boolean newlev)
             intemple(roomno + ROOMOFFSET);
         /*FALLTHRU*/
         default:
-            msg_given = (rt == TEMPLE);
+            msg_given = (rt == TEMPLE || rt >= SHOPBASE);
             rt = 0;
             break;
         }