[chronojump] Minor fix on delete_encoder_curve callback

[Xavier de Blas <xaviblas src gnome org>]

commit 6a3966d345fb0a739d383255ab5fb53845cddd1c
Author: Xavier de Blas <xaviblas gmail com>
Date:   Tue Aug 2 15:03:18 2016 +0200

    Minor fix on delete_encoder_curve callback

 src/gui/encoder.cs |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/gui/encoder.cs b/src/gui/encoder.cs
index f2dec05..30c5a06 100644
--- a/src/gui/encoder.cs
+++ b/src/gui/encoder.cs
@@ -1089,6 +1089,7 @@ public partial class ChronoJumpWindow
                        
        void on_delete_encoder_curve (object o, EventArgs args)
        {
+               encSelReps.FakeButtonDeleteCurve.Clicked -= new EventHandler(on_delete_encoder_curve);
                LogB.Information("at on_delete_encoder_curve");
                delete_encoder_curve(false, encSelReps.DeleteCurveID);
        }