This reverts commit 7ed0d6f2e8d5a8192c5621898b3ff920c95b66dc.
This was intended as a possible fix for problems with the HL-L2300D
(#4), but it didn't help. And it worsens compression.
The official Brother driver treats Tumble and NoTumble differently, adding &l2S and &l1S respectively to the header.
Unfortunately, for me this resulted in missing lines in NoTumble. By treating everything as Tumble and simply sending data rotated 180 for Tumble we get a good quality printout.