Fixed typos.

lib/pixi/deepzoom/tile.js

@@ -48,10 +48,11 @@ export default class Tile extends PIXI.Sprite {
      * Returns true iff the url is pending
      *
      * @static
+     * @param {*} url
      * @returns
      * @memberof Tile
      */
-    static isPending() {
+    static isPending(url) {
         return pendingTiles.has(url) && pendingTiles.get(url) > 0
     }
 
@@ -193,7 +194,7 @@ export default class Tile extends PIXI.Sprite {
      * @param {*} texture 
      */
     static lateTexture(url, texture) {
-        let destroyBase = !deepZoomTileCache.has(url)
+        let destroyBase = !registeredTiles.has(url)
         texture.destroy(destroyBase)
     }