Fix BLACK color definition for eInk display

Author: BlitzCityDIY

Bare_eInk_Guide/400x300_monochrome_python/code.py

@@ -16,7 +16,7 @@
 
 # First define some color constants
 WHITE = (0xFF, 0xFF, 0xFF)
-BLACK = (0xFF, 0x00, 0x00)
+BLACK = (0x00, 0x00, 0x00)
 
 # Next define some constants to allow easy resizing of shapes and colors
 BORDER = 20