title: Fabric Js Image blend Filter and change Image src issues
body: <p>When I'm trying to change image src in FabricJS works fine but after add filter (blend image) to that image change src not working :</p>
  
  <p>Change image src code :</p>
  
  <pre><code>function replaceImage(imgLink) {  
    fabric.Image.fromURL(imgLink, function(img) {
      var object = canvas.getActiveObject();
      object._element.src = imgLink;
      canvas.renderAll();
    });
  }
  </code></pre>
  
  <p>add filter code :</p>
  
  <pre><code>   filter2 = new fabric.Image.filters.BlendImage({
        image: mainObject,
        mode: 'mask',
        alpha: 0.5
     });
  
    let object = canvas.getActiveObject(); 
    object.filters.push(filter2);
    object.applyFilters();
    canvas.renderAll();
  </code></pre>