Use 400 byte invalidate command for QL-8XX models. #26
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QL-800, QL-810W, and QL-820NWB need 400 byte long invalidate commands, as seen on page 5 of the manual [1].
This PR specifically avoids the use of the deprecated devicedependent module.
[1] https://download.brother.com/welcome/docp100278/cv_ql800_eng_raster_100.pdf
Originally by @kku1993 / pklaus#107