Curses UI: Reset the warn method before terminate

The warn() method tries to set the color to red. This leads to a garbled
tty after endwin() has been called. So lets simply use the UIBase
implementation.

Signed-off-by: Christoph Höger <christoph.hoeger@tu-berlin.de>

Changelog.rst

@@ -9,6 +9,7 @@ WIP (add new stuff for the next release)
 ========================================
 
 * bump bundled imaplib2 library 2.29 --> 2.33
+* Curses UI, don't use colors after we shut down curses already (C.Höger)
 
 OfflineIMAP v6.5.3.1 (2012-04-03)
 =================================

offlineimap/ui/Curses.py

@@ -613,6 +613,8 @@ class Blinkenlights(UIBase, CursesUtil):
         # basic one, so exceptions and stuff are properly displayed
         self.logger.removeHandler(self._log_con_handler)
         UIBase.setup_consolehandler(self)
+        # reset the warning method, we do not have curses anymore
+        self.warn = super(Blinkenlights, self).warn
         # finally call parent terminate which prints out exceptions etc
         super(Blinkenlights, self).terminate(*args, **kwargs)