Merge pull request #40 from caternuson/iss32

Fix white channel getting set 0.

Author: ladyada

adafruit_seesaw/neopixel.py

@@ -99,7 +99,7 @@ def __setitem__(self, key, color):
 
         # If all components are the same and we have a white pixel then use it
         # instead of the individual components.
-        if self._bpp == 4 and r == g == b:
+        if self._bpp == 4 and r == g == b and w == 0:
             w = r
             r = 0
             g = 0