TrueRgb888 broken?

Is this mode supposed to work?

I tried modifying the test.cpp with `pZeDMD->EnableTrueRgb888(true);` but then I get this

```
Render true rgb888 raw: test/rgb888_128x32/0001.raw
Render true rgb888 raw: test/rgb888_128x32/0002.raw
Full frame forced, error 0
ZeDMD StreamBytes failed
Render true rgb888 raw: test/rgb888_128x32/0003.raw
Full frame forced, error 0
ZeDMD StreamBytes failed
```
