OO-3937: close the editor sync

src/main/java/org/olat/modules/wopi/collabora/ui/_content/collabora.html

@@ -14,7 +14,7 @@
 				}
 				
 				if (msgId === 'UI_Close' || msgId === 'close' /* deprecated */) {
-					$r.backgroundCommand("close");
+					$r.openJavaScriptCommand("close"));
 				}
 			});
 		});