fix keybindings listen - ignore KeyEventState when checking for Esc (#18867)

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## Description
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In some contexts (seemingly, when the Kitty keyboard protocol is enabled
and supported by the terminal emulator), it's possible for `keybindings
listen` to not quit when pressing `Esc` if NumLock (and maybe caps lock)
are turned on.
The existing "check for Escape" logic checks that (among other things)
`KeyEventState` is `NONE`. This change relaxes precisely the
`KeyEventState` check, so e.g. Ctrl+Escape is still reported and doesn't
quit `keybindings listen`, but Escape by itself exits, even when NumLock
is reported.

## User-facing changes (Release notes)
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Fixed an issue in `keybindings listen` where `Esc` wouldn't quit if a
state (e.g. `NumLock` or `CapsLock`) was reported.

## Additional notes
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- fixes #123
- closes #456
- related #789

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potentially fixes #14919

crates/nu-cli/src/commands/keybindings_listen.rs

@@ -98,7 +98,14 @@ pub fn print_events(config: &Config, span: Span) -> Result<Value, ShellError> {
     loop {
         let event = crossterm::event::read()
             .map_err(|err| IoError::new_internal(err, "Could not read event"))?;
-        if event == Event::Key(KeyCode::Esc.into()) {
+        // match Esc with no modifiers, but ignoring KeyEventState (e.g. NumLock/CapsLock)
+        if let Event::Key(KeyEvent {
+            code: KeyCode::Esc,
+            modifiers: crossterm::event::KeyModifiers::NONE,
+            kind: crossterm::event::KeyEventKind::Press,
+            ..
+        }) = event
+        {
             break;
         }
         // stdout.queue(crossterm::style::Print(format!("event: {:?}", &event)))?;