Update environment map previews.

source/website/featureset.js

@@ -1,4 +1,4 @@
 export const FeatureSet =
 {
-    EnvironmentMap : false
+    EnvironmentMap : true
 };

source/website/sidebarsettingspanel.js

@@ -119,7 +119,7 @@ class EnvironmentMapPopup extends PopupDialog
             }
         } else if (shadingType === ShadingType.Physical) {
             let checkboxDiv = AddDiv (contentDiv, 'ov_environment_map_checkbox');
-            let backgroundIsEnvMapCheckbox = AddCheckbox (checkboxDiv, 'use_as_background', 'Use as background', settings.backgroundIsEnvMap, () => {
+            let backgroundIsEnvMapCheckbox = AddCheckbox (checkboxDiv, 'use_as_background', 'Use as background image', settings.backgroundIsEnvMap, () => {
                 settings.backgroundIsEnvMap = backgroundIsEnvMapCheckbox.checked;
                 callbacks.onEnvironmentMapChange ();
             });

website/css/sidebar.css

@@ -117,7 +117,7 @@ div.ov_environment_map_checkbox
 img.ov_environment_map_preview
 {
 	width: 160px;
-	height: 90px;
+	height: 88px;
 	display: block;
 	float: left;
 	padding: 1px;