[meld] filediff: Fix deprecated GObject.property usage

[Kai Willadsen <kaiw src gnome org>]

commit 9f6c9e0e740f437d4f965ca1f9c8561bd974a81a
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Mon May 6 09:16:54 2019 +1000

    filediff: Fix deprecated GObject.property usage

 meld/filediff.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meld/filediff.py b/meld/filediff.py
index ae767de8..c59e82cf 100644
--- a/meld/filediff.py
+++ b/meld/filediff.py
@@ -212,7 +212,7 @@ class FileDiff(Gtk.VBox, MeldDoc):
         default=ActionMode.Replace,
     )
 
-    lock_scrolling = GObject.property(
+    lock_scrolling = GObject.Property(
         type=bool,
         nick='Lock scrolling of all panes',
         default=False,