Hide the unneeded mediaelement.js play button

sharedcode/css/4.0.css

@@ -360,6 +360,9 @@ a[class^="quick-link-"] {
background-size: 4.499em;
}
}
+.wdn-video-band .mejs-overlay-button {
+  display: none;
+}
.wdn-video-band img {
display: block;
}