Revert "Anchor loader pulsar to avoid jumping around"

This reverts commit b63e653.

Author: felliott

mfr/server/static/css/mfr.css

@@ -35,23 +35,6 @@ This CSS was stripped out of base.css from the osf-style repo.
   background-color: #337AB7;
 }
 
-.ball-scale {
-    position: absolute;
-    display: flex;
-    justify-content: center;
-    align-items: center;
-    width: 100%;
-    height: 250px;
-}
-
 .embed-responsive-pdf {
     padding-bottom: 95%;
 }
-
-#mfrIframe iframe {
-    display: none;
-}
-
-#mfrIframe {
-    min-height: 250px;
-}

mfr/server/static/js/mfr.child.js

@@ -16,7 +16,7 @@
                 }
             });
         });
-    }, false);
+    });
 
     window.addEventListener('resize', function () {
         window.pymChild.sendHeight();

mfr/server/static/js/mfr.js

@@ -80,10 +80,9 @@
             self.pymParent.iframe.setAttribute('sandbox', 'allow-scripts allow-popups allow-same-origin');
 
             self.pymParent.el.appendChild(self.spinner);
-            $(self.pymParent.iframe).on('load', function() {
+            $(self.pymParent.iframe).on('load', function () {
                 self.pymParent.el.removeChild(self.spinner);
-                this.style.display = "block"
-            })
+            });
 
             self.pymParent.onMessage('embed', function(message) {
                 _addClass(self.pymParent.el, 'embed-responsive');