Fix column set in document list action slot

Reproduce

• go into search
• change column setting (add all columns to visible)
• refresh
  => all columns are still visible
• click spreadsheet action
  =!> only default (and not all) columns appear.

notes

1. if you click column settings and remove one column and click spreadsheet editor again, correct columns appear
2. seems that the column variable in the slot scope is not well defined at the beginning