[Ohrrpgce] [ohrrpgce/ohrrpgce] BMP export with width % 4 == 1 is broken (#1143)

[Ralph Versteegen]

Exporting a 16-color BMP with ` width % 4 == 1` (e.g. 33x40) results either in the image being skewed, e.g.
![badbmpexport](https://user-images.githubusercontent.com/1165449/89711960-b1ad1200-d9e1-11ea-95d6-371309200135.png)

or it produces a completely invalid file, with ImageMagick reporting:
```
display: length and filesize do not match `aaa largeenemy set 1.bmp' @ error/bmp.c/ReadBMPImage/846.
display: insufficient image data in file `aaa largeenemy set 1.bmp' @ error/bmp.c/ReadBMPImage/990.
```

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https://github.com/ohrrpgce/ohrrpgce/issues/1143
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