Add orange to spectra palette

[missionfloyd]

I noticed that palette index 4 is skipped for Spectra 6 panels.

e-Paper/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd7in3e.py

Line 183 in ecdd8cf

pal_image.putpalette( (0,0,0, 255,255,255, 255,255,0, 255,0,0, 0,0,0, 0,0,255, 0,255,0) + (0,0,0)*249)

So I tried sending 0x04, and it turns out it's actually capable of displaying orange.

(Code that created this image)

buf = []
for i in range(7):
    buf += [(i << 4) + i] * int(width * height / 14)

This fills in the missing slot with orange. I've only done it for python because I'm not as familiar with how the C libraries work.