Simplify default export

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

src/ol/style/IconAnchorUnits.js

@@ -1,13 +1,12 @@
 /**
  * @module ol/style/IconAnchorUnits
  */
+
 /**
  * Icon anchor units. One of 'fraction', 'pixels'.
  * @enum {string}
  */
-var _ol_style_IconAnchorUnits_ = {
+export default {
   FRACTION: 'fraction',
   PIXELS: 'pixels'
 };
-
-export default _ol_style_IconAnchorUnits_;

src/ol/style/IconOrigin.js

@@ -1,15 +1,14 @@
 /**
  * @module ol/style/IconOrigin
  */
+
 /**
  * Icon origin. One of 'bottom-left', 'bottom-right', 'top-left', 'top-right'.
  * @enum {string}
  */
-var _ol_style_IconOrigin_ = {
+export default {
   BOTTOM_LEFT: 'bottom-left',
   BOTTOM_RIGHT: 'bottom-right',
   TOP_LEFT: 'top-left',
   TOP_RIGHT: 'top-right'
 };
-
-export default _ol_style_IconOrigin_;

src/ol/style/TextPlacement.js

@@ -1,6 +1,7 @@
 /**
  * @module ol/style/TextPlacement
  */
+
 /**
  * Text placement. One of `'point'`, `'line'`. Default is `'point'`. Note that
  * `'line'` requires the underlying geometry to be a {@link ol.geom.LineString},
@@ -8,9 +9,7 @@
  * {@link ol.geom.MultiPolygon}.
  * @enum {string}
  */
-var _ol_style_TextPlacement_ = {
+export default {
   POINT: 'point',
   LINE: 'line'
 };
-
-export default _ol_style_TextPlacement_;