[evince] backend: Fix warning due to wrong enumeration value

[Germán Poo-Caamaño <gpoo src gnome org>]

commit 52994f3669c51b51ab90eb28d76d20be3bc92793
Author: Germán Poo-Caamaño <gpoo gnome org>
Date:   Mon Jun 22 00:58:02 2020 -0400

    backend: Fix warning due to wrong enumeration value
    
    Use Poppler enumeration instead of Evince's one.

 backend/pdf/ev-poppler.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/backend/pdf/ev-poppler.cc b/backend/pdf/ev-poppler.cc
index 911894b9..7567f851 100644
--- a/backend/pdf/ev-poppler.cc
+++ b/backend/pdf/ev-poppler.cc
@@ -2734,7 +2734,7 @@ ev_form_field_from_poppler_field (PdfDocument      *pdf_document,
                                case POPPLER_FORM_CHOICE_COMBO:
                                        ev_choice_type = EV_FORM_FIELD_CHOICE_COMBO;
                                        break;
-                               case EV_FORM_FIELD_CHOICE_LIST:
+                               case POPPLER_FORM_CHOICE_LIST:
                                        ev_choice_type = EV_FORM_FIELD_CHOICE_LIST;
                                        break;
                        }