fix(cosmoz-data-nav): prevent creation of a new stacking context (#170)

Because of the default 0px transform data-nav creates a new stacking context
that prevents us from correctly positioning elements in dropdown menu
without moving to body.

Author: megheaiulian

cosmoz-data-nav.js

@@ -35,11 +35,6 @@ class CosmozDataNav extends hauntedPolymer('haunted', useDataNav)(PolymerElement
 					overflow-x: hidden;
 				}
 
-				#items,
-				#items > ::slotted(.animatable){
-					transform: translateX(0px);
-				}
-
 				#items,
 				#items > ::slotted(.animatable) {
 					position: absolute;