termwiz: ignore caps/num lock when encoding keys in xterm encoding

refs: https://github.com/wez/wezterm/issues/3517

termwiz/src/input.rs

@@ -277,6 +277,8 @@ impl KeyCode {
             _ => mods,
         };
 
+        let mods = mods.remove_keyboard_status_mods();
+
         // Normalize Backspace and Delete
         let key = match key {
             Char('\x7f') => Delete,