fix typing

Author: Carreau

src/prompt_toolkit/input/kitty_keyboard.py

@@ -275,7 +275,7 @@ def _apply_modifiers(base: Keys, ctrl: bool, shift: bool) -> Keys:
         if shift:
             return Keys.ShiftEscape
         return Keys.Escape
-
+    ctrl_key: Keys | None
     if base in _NAV_MAP:
         shift_key, ctrl_key, ctrl_shift_key = _NAV_MAP[base]
         if ctrl and shift:
@@ -291,7 +291,7 @@ def _apply_modifiers(base: Keys, ctrl: bool, shift: bool) -> Keys:
     # emulate that here; Shift+Fn just returns Fn for now.
     if base.value.startswith("f") and base.value[1:].isdigit():
         if ctrl:
-            ctrl_key: Keys | None = getattr(Keys, "Control" + base.name, None)
+            ctrl_key = getattr(Keys, "Control" + base.name, None)
             if ctrl_key is not None:
                 return ctrl_key
         return base