[gnome-calculator] Ctrl+Backspace should deletes only last number, not everything (bgo#725114)

[Robert Roth <robertroth src gnome org>]

commit 606dbdb1eb5c44f5062e941e5e2962cf61720822
Author: Robert Roth <robert roth off gmail com>
Date:   Tue Oct 11 15:21:32 2016 +0300

    Ctrl+Backspace should deletes only last number, not everything (bgo#725114)

 src/math-display.vala |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/src/math-display.vala b/src/math-display.vala
index 9df510f..7a155fb 100644
--- a/src/math-display.vala
+++ b/src/math-display.vala
@@ -211,7 +211,6 @@ public class MathDisplay : Gtk.Viewport
 
         /* Clear on escape */
         if ((event.keyval == Gdk.Key.Escape && state == 0) ||
-            (event.keyval == Gdk.Key.BackSpace && state == Gdk.ModifierType.CONTROL_MASK) ||
             (event.keyval == Gdk.Key.Delete && state == Gdk.ModifierType.SHIFT_MASK))
         {
             equation.clear ();