[gnome-contacts] ContactsView: remove compiler definition.

[Niels De Graef <nielsdg src gnome org>]

commit 0349ccbcce9ba1fb2a9b6af84ea43f4993d7a3c4
Author: Niels De Graef <nielsdegraef gmail com>
Date:   Sat Dec 23 10:33:20 2017 +0100

    ContactsView: remove compiler definition.
    
    Vala with version < 0.24 has been quite some time ago, so let's drop
    support for it.

 src/contacts-view.vala |    4 ----
 1 files changed, 0 insertions(+), 4 deletions(-)
---
diff --git a/src/contacts-view.vala b/src/contacts-view.vala
index 61d49ee..8726b75 100644
--- a/src/contacts-view.vala
+++ b/src/contacts-view.vala
@@ -264,11 +264,7 @@ public class Contacts.View : ListBox {
     data.destroy ();
   }
 
-#if VALA_0_24
   public override void row_selected (ListBoxRow? row) {
-#else
-  public override void row_selected (ListBoxRow row) {
-#endif
     var data = row as ContactDataRow;
     var contact = data != null ? data.contact : null;
     selection_changed (contact);