[shotwell] Drop check for VALA 0.20

[Jens Georg <jensgeorg src gnome org>]

commit f11b8e2e6052e52ba24947289eca55b229fbde83
Author: Jens Georg <mail jensge org>
Date:   Sat Feb 23 20:00:39 2019 +0100

    Drop check for VALA 0.20

 src/DragAndDropHandler.vala | 5 -----
 1 file changed, 5 deletions(-)
---
diff --git a/src/DragAndDropHandler.vala b/src/DragAndDropHandler.vala
index 4348de22..ece6d9d7 100644
--- a/src/DragAndDropHandler.vala
+++ b/src/DragAndDropHandler.vala
@@ -89,13 +89,8 @@ public class DragAndDropHandler {
         }
 
         // set the XDS property to indicate an XDS save is available
-#if VALA_0_20
         Gdk.property_change(context.get_source_window(), XDS_ATOM, TEXT_ATOM, 8, Gdk.PropMode.REPLACE,
             XDS_FAKE_TARGET, 1);
-#else
-        Gdk.property_change(context.get_source_window(), XDS_ATOM, TEXT_ATOM, 8, Gdk.PropMode.REPLACE,
-            XDS_FAKE_TARGET);
-#endif
     }
 
     private void on_drag_data_get(Gdk.DragContext context, Gtk.SelectionData selection_data,