Demos: Fix custom style tooltip demo

Fixes typo in 'transform' property, also removes unnecessary prefixes (based
on our browser support and caniuse.com data).

Fixes jquery/jqueryui.com#68

Author: jzaefferer

demos/tooltip/custom-style.html

@@ -66,10 +66,8 @@
 		height: 25px;
 		box-shadow: 6px 5px 9px -9px black;
 		-webkit-transform: rotate(45deg);
-		-moz-transform: rotate(45deg);
 		-ms-transform: rotate(45deg);
-		-o-transform: rotate(45deg);
-		tranform: rotate(45deg);
+		transform: rotate(45deg);
 	}
 	.arrow.top:after {
 		bottom: -20px;