Import dialog always shows "Import canceled" even when import is working

[stefan-kolb]

ImportEntriesDialog.java:

        setResultConverter(button -> {
            if (button == importButton) {
                viewModel.importEntries(entriesListView.getCheckModel().getCheckedItems());
            } else {
                dialogService.notify(Localization.lang("Import canceled"));
            }

            return null;
        });

[Siedlerchr]

Known bug or javafx feature, had this before, the resultConverter is called twice.
Duplicate of #4841