Remove buttons update on javascript

       It also fixes URL edition

static/canvas.js

@@ -89,9 +89,6 @@ let draw = function() {
       ctx.fillStyle = fgColor;
       ctx.fillText(fillText, width * 0.08, height * 0.2 + fontSize * 1.4);
 
-      // Update download button
-      document.querySelector('#save-image > a').href = canvas.toDataURL();
-
       // Edit URL
       history.replaceState('', '', window.location.pathname + '?'
 			   + 'bg-color=' + encodeURIComponent(bgColor)
@@ -101,12 +98,6 @@ let draw = function() {
 			   + '&icon=' + encodeURIComponent(icon)
 			   + '&signature=' + encodeURIComponent(signature)
 			   + window.location.hash);
-
-      // Update tweet button
-      document.querySelector('#tweet-button a').href = 'https://twitter.com/intent/tweet?text=Soutenez La Quadrature du Net ! ' + encodeURIComponent(window.location.href.split('#')[0]);
-
-      // Update facebook button
-      document.querySelector('#fb-button a').href = 'https://www.facebook.com/sharer/sharer.php?u=' + encodeURIComponent(window.location.href.split('#')[0]);
     }, false);
   });
 }