Close the client's dialogs with Escape

Only the option-pane prompts closed on Escape, because Swing installs
that binding on the option pane itself. Dialogs.closeOnEscape puts the
same window-wide binding on a dialog's root pane, routed to whatever
that dialog does when its Close or Cancel button is pressed — reverting
the live-previewing settings, or flushing the bookmark being edited.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

ts3-client/swing/src/main/java/com/ts3client/ui/AwayMessagesDialog.java

@@ -51,6 +51,7 @@ public final class AwayMessagesDialog extends JDialog {
         getContentPane().add(scroll, BorderLayout.CENTER);
         getContentPane().add(buildButtons(), BorderLayout.SOUTH);
 
+        Dialogs.closeOnEscape(this, this::closeDialog);
         setDefaultCloseOperation(DISPOSE_ON_CLOSE);
         setSize(new Dimension(360, 300));
         setLocationRelativeTo(owner);