segments: Removing property two_dots_center

The "colon" property already allow to control these LEDs so remove
two_dots_center because of the redundancy.

Author: vdehors

adafruit_ht16k33/segments.py

@@ -334,15 +334,6 @@ def _getindicator(self, index):
         bitmask = 1 << (index + 1)
         return self._get_buffer(0x04) & bitmask
 
-    @property
-    def two_dots_center(self):
-        """The two dots at the center indicator."""
-        return bool(self._getindicator(0))
-
-    @two_dots_center.setter
-    def two_dots_center(self, value):
-        self._setindicator(0, value)
-
     @property
     def top_left_dot(self):
         """The top-left dot indicator."""