Simplify default export

This removes unnecessary variable declarations where the default object is an object.

src/ol/TileState.js

@@ -1,10 +1,11 @@
 /**
  * @module ol/TileState
  */
+
 /**
  * @enum {number}
  */
-var _ol_TileState_ = {
+export default {
   IDLE: 0,
   LOADING: 1,
   LOADED: 2,
@@ -12,5 +13,3 @@ var _ol_TileState_ = {
   EMPTY: 4,
   ABORT: 5
 };
-
-export default _ol_TileState_;