Don't make Blinkenlight statuschar configurable

Allowing to specify the char to use in the BLinkenlights is a bit over
the top and bloats our default offlineimap.conf. The dot is just fine,
so let us settle for it and cut the example config file by an unneeded
section.

Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>

offlineimap/ui/Curses.py

@@ -230,7 +230,7 @@ class CursesThreadFrame:
             if self.getcolor() == 'black':
                 self.window.addstr(self.y, self.x, ' ', self.color)
             else:
-                self.window.addstr(self.y, self.x, self.ui.config.getdefault("ui.Curses.Blinkenlights", "statuschar", '.'), self.color)
+                self.window.addstr(self.y, self.x, '.', self.color)
             self.c.stdscr.move(self.c.height - 1, self.c.width - 1)
             self.window.refresh()
         self.c.locked(lockedstuff)