[seahorse] KeyManagerStore: remove deprecated line

[Niels De Graef <nielsdg src gnome org>]

commit 82c1d1f552f6ee4f418d5e7310abe9b5835841cc
Author: Niels De Graef <nielsdegraef gmail com>
Date:   Sat Jan 12 14:05:50 2019 +0100

    KeyManagerStore: remove deprecated line
    
    `GtkTreeView::set_rules_hint()` is deprecated and not really relevant
    for our use case anyway, so just remove it.

 common/key-manager-store.vala | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/common/key-manager-store.vala b/common/key-manager-store.vala
index 827c582b..0db3d06b 100644
--- a/common/key-manager-store.vala
+++ b/common/key-manager-store.vala
@@ -173,7 +173,6 @@ public class Seahorse.KeyManagerStore : Gcr.CollectionModel {
 
         view.set_enable_search(false);
         view.set_show_expanders(false);
-        view.set_rules_hint(true);
         view.set_headers_visible(false);
 
         set_sort_column_id (Column.LABEL, Gtk.SortType.ASCENDING);