Structure with disallowed duplication has no delete label

[adamkiss]

Description

When you turn off row duplication for a structure field, the delete label is empty for whatever reason.

Observed in v4.2.0, v4.5.0 and v5-beta.1.

Expected behavior
Duplication is disallowed, delete button is visible normally.

Screenshots

To reproduce

Minimal test working in every site I tried this in (four total):

test:
  type: structure
  label: Structure test
  duplicate: false
  fields:
    whatever:
      type: text

[adamkiss]

Tracked it down here

kirby/panel/src/components/Forms/Field/StructureField.vue

Line 293 in 94cc37e

text: more ? this.$t("delete") : null,

more is set here:

kirby/panel/src/components/Forms/Field/StructureField.vue

Line 274 in 94cc37e

let more = this.duplicate && this.more;

Don't know what exactly more should do, but the whole line doesn't make sense (add the button, but set the text to null if completely unrelated thing is set to false?)