Fix device default settings

[tuxmaster]

• Fix device default role size
• Fix device pixels:
  • See https://files.support.epson.com/pdf/pos/bulk/tm-u220_trg_en_std_reve.pdf page 22
  • See Image printing prints only garbage python-escpos/python-escpos#598

[patkan]

Hi, does this change apply to all devices of this type? Or is it possible that also devices with 400px width exist?

[tuxmaster]

@patkan this will apply to all devices of this series, See the first link.

[belono]

The printer seems to accept 3 different paper widths (76mm, 69.5mm and 57.5mm) with different number of pixels per line (200px, 180px and, 150px respectively).

[belono]

@tuxmaster
You could also add the media.dpi field to the TM-U220 profile with a value of 80 that seems common to all the printer series.

media:
   dpi: 80

[patkan]

The printer seems to accept 3 different paper widths (76mm, 69.5mm and 57.5mm) with different number of pixels per line (200px, 180px and, 150px respectively).

I think we should then provide three profiles.