test: remove broken steps from files acceptance test

test: remove broken steps from files acceptance test

The acceptance tests using the recent view fail since the vue migration.

`And I open the details view for "welcome.txt"`

Is looking for a row in the filelist with a span having the class nametext, matching the file name "welcome.txt" and button inside having the class action-menu.

The markup for the files list looks very different after the vue migration and therefor the test is failing.

Signed-off-by: Daniel Kesselberg <mail@danielkesselberg.de>