fix(menu): don't prevent setting the text color of an item (#513)

Author: slook

libs/pyTermTk/TermTk/TTkWidgets/menu.py

@@ -155,7 +155,6 @@ def setText(self, text):
         :param text:
         :type text: :py:class:`TTkString`
         '''
-        if self._text == text: return
         self._text = TTkString(text)
         self.textChanged.emit(self._text)
         self.update()