Don't add close button on popout

src/screen/dashboard/pane.rs

@@ -262,7 +262,7 @@ impl TitleBar {
         }
 
         // Add delete as long as it's not a single empty buffer
-        if !(panes == 1 && matches!(buffer, Buffer::Empty)) {
+        if !(is_popout || panes == 1 && matches!(buffer, Buffer::Empty)) {
             let close_button = button(center(icon::cancel()))
                 .padding(5)
                 .width(22)