use the correct attribute

Author: totaam

html5/js/Client.js

@@ -3174,7 +3174,7 @@ class XpraClient {
     );
     if (this.server_is_desktop || this.server_is_shadow) {
       window.noWindowList();
-    } else if (win && win.has_decorations) {
+    } else if (win && win.decorations) {
       const trimmedTitle = Utilities.trimString(win.title, 30);
       window.addWindowListItem(win, wid, trimmedTitle);
     }
@@ -3311,7 +3311,7 @@ class XpraClient {
   _process_lost_window(packet) {
     const wid = packet[1];
     const win = this.id_to_window[wid];
-    if (win && win.has_decorations) {
+    if (win && win.decorations) {
       window.removeWindowListItem(wid);
     }
     try {