ds_field_ui_display_overview_multistep_submit() seems like leftover code

Seems like most issues are for 8.x-3.x.

Not sure what to make of the test failure.
Let's get one round of feedback first.

Ha, interesting! IIRC #submit is called when JS is not enabled, but maybe we can just simply ignore that and remove the submit handler completely. I'll try to reproduce with JS disabled first though and see if there's a crash.

Tests should be green again too, fixed that in another issue.

No effect or crashes when JS is disabled, so merged, thanks!

swentel → closed merge request !39