tui: Allow handlers to finalize() as well as initialize()

kittens/unicode_input/main.py

@@ -327,8 +327,7 @@ class UnicodeInput(Handler):
         self.write(set_line_wrapping(False))
         self.write(set_window_title(_('Unicode input')))
 
-    def initialize(self, *args):
-        Handler.initialize(self, *args)
+    def initialize(self):
         self.init_terminal_state()
         self.draw_screen()