Remove calls to SetWH

Fixes mathjax#268

Author: pkra

lib/mj-page.js

@@ -792,7 +792,6 @@ function MakeIMG() {
        src:"data:image/svg+xml;base64,"+svg, style:{cssText:css},
         className: "MathJax_SVG_IMG",
       });
-      SetWH(img,w,h); // work around jsdom bug with width and height CSS
       if (data.speakText) img.setAttribute("alt",MathJax.Hub.getJaxFor(nodes[i]).speech);
       nodes[i].parentNode.replaceChild(img,nodes[i]);
     }
@@ -831,7 +830,6 @@ function MakePNG() {
                 src:"data:image/png;base64,"+buffer.toString('base64'),
                 style:{cssText:css}, className: "MathJax_PNG_IMG",
               });
-              SetWH(img,w,h); // work around jsdom bug with width and height CSS
               if (data.speakText) img.setAttribute("alt",MathJax.Hub.getJaxFor(nodes[i]).speech);
               nodes[i].parentNode.replaceChild(img,nodes[i]);
             }