Define browser specific IMAGE_SMOOTHING_DISABLED

Avoid msImageSmoothingEnabled if the browser does not need it

src/ol/source/common.js

@@ -1,6 +1,7 @@
 /**
  * @module ol/source/common
  */
+import {FIREFOX, SAFARI, WEBKIT} from '../has.js';
 
 /**
  * Default WMS version.
@@ -12,7 +13,9 @@ export const DEFAULT_WMS_VERSION = '1.3.0';
  * Context options to disable image smoothing.
  * @type {Object}
  */
-export const IMAGE_SMOOTHING_DISABLED = {
+export const IMAGE_SMOOTHING_DISABLED = FIREFOX || SAFARI || WEBKIT
-  imageSmoothingEnabled: false,
+  ? {imageSmoothingEnabled: false}
-  msImageSmoothingEnabled: false,
+  : {
-};
+    imageSmoothingEnabled: false,
+    msImageSmoothingEnabled: false,
+  };