Allow teleportation onto the Vibrating Square

It's a minor annoyance when you forget you can't do this in vanilla and
then get relocated somewhere random on the level. Since it's not a
harmful "trap", just allow the adventurer to teleport directly onto it.

doc/fixes37.0

@@ -15,6 +15,7 @@ message "your knapsack can't accomodate any more items" when picking stuff up
 	pending; vary the message rather than add more convoluted pickup code
 function calls made from mapglyph based on dungeon level are now called once
 	per level
+allow teleporting onto the vibrating square
 
 
 Fixes to Pre-3.7.0 Problems that Were Exposed Via git Repository