[marketplace] Fix problem with frame border in IE.

Author: AlexeyMatveev686

store/plugin/index.html

@@ -26,6 +26,7 @@
 			iframe {
 				width: 100%;
 				height: 100%;
+				border: none;
 			}
 			html, body {
 				margin: 0px !important;

store/plugin/scripts/code.js

@@ -24,7 +24,6 @@
 
 	document.addEventListener("DOMContentLoaded", function() {
 		let pageUrl = "https://onlyoffice.github.io/store/index.html";
-		iframe.style = "width:100%; border:none;";
 		iframe.src = pageUrl + window.location.search;
 		document.body.appendChild(iframe);
 		iframe.onload = function() {