remove deprecated imageSmoothing

src/ol/source/ImageArcGISRest.js

@@ -19,7 +19,6 @@ import {containsExtent, getHeight, getWidth} from '../extent.js';
  * the remote server.
  * @property {import("../Image.js").LoadFunction} [imageLoadFunction] Optional function to load an image given
  * a URL.
- * @property {boolean} [imageSmoothing=true] Deprecated.  Use the `interpolate` option instead.
  * @property {boolean} [interpolate=true] Use interpolated values when resampling.  By default,
  * linear interpolation is used when resampling.  Set to false to use the nearest neighbor instead.
  * @property {Object<string,*>} [params] ArcGIS Rest parameters. This field is optional. Service
@@ -58,15 +57,9 @@ class ImageArcGISRest extends ImageSource {
   constructor(opt_options) {
     const options = opt_options ? opt_options : {};
 
-    let interpolate =
-      options.imageSmoothing !== undefined ? options.imageSmoothing : true;
-    if (options.interpolate !== undefined) {
-      interpolate = options.interpolate;
-    }
-
     super({
       attributions: options.attributions,
-      interpolate: interpolate,
+      interpolate: options.interpolate,
       projection: options.projection,
       resolutions: options.resolutions,
     });