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epson2: disable focus properly

Wolfram Sang requested to merge wsakernel/backends:epson2/disable_focus_properly into master

The old epson driver disabled the focus by erasing the setFocus command. The epson2 driver turned it into a seperate flag. However, scanners which disabled focus in post_init were not converted to use the new flag. Because we meanwhile set focus during init, these scanners could not start anymore. Convert them to use the new flag.

While here, update the comment how we handle focus detection and update the debug strings accordingly.

Bug reported by Hans Meir and debugged by Zdenek Dohnal. Many thanks!

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