DKB changed name of credit card selection form
Change "name_for_label" to the more appropriate id_for_label,
since it returns the dom_id of the label's input-field.

This makes it also necessary to use "dom_id" to get the correct field
to enter  the login name.
Merge branch 'master' of git://github.com/my-flow/dkb-visa-read.git