[niepce] Fix image display not being triggered

[Hubert Figuière <hub src gnome org>]

commit 637906912ea8acdc0bd34cf1290d528d3cab555d
Author: Hubert Figuière <hub figuiere net>
Date:   Sat May 1 20:26:55 2021 -0400

    Fix image display not being triggered

 niepce-main/src/niepce/ui/image_list_store.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/niepce-main/src/niepce/ui/image_list_store.rs b/niepce-main/src/niepce/ui/image_list_store.rs
index 0c9ebd6..41f0462 100644
--- a/niepce-main/src/niepce/ui/image_list_store.rs
+++ b/niepce-main/src/niepce/ui/image_list_store.rs
@@ -237,7 +237,7 @@ impl ImageListStore {
                 .get_value(&iter, ColIndex::File as i32)
                 .get::<&StoreLibFile>()
             {
-                libfile.map(|v| v.0.clone());
+                return libfile.map(|v| v.0.clone());
             }
         }
         None