[gnome-calculator] remove red color from clear button

[Michael Catanzaro <mcatanzaro src gnome org>]

commit d7f8c373b4d0a78df52a6f2bb258dfd923d877d6
Author: Allan Day <allanpday gmail com>
Date:   Mon Feb 2 15:57:36 2015 +0000

    remove red color from clear button
    
    The red attracts too much attention, and the clear button doesn't
    need to be that scary.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=743523

 src/math-buttons.vala |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)
---
diff --git a/src/math-buttons.vala b/src/math-buttons.vala
index 088b591..43a1c17 100644
--- a/src/math-buttons.vala
+++ b/src/math-buttons.vala
@@ -624,9 +624,6 @@ public class MathButtons : Gtk.Box
         if (name == "result") /* Adds blue color to result button */
             button.get_style_context ().add_class ("suggested-action");
 
-        if (name == "clear") /* Adds red color to clear button */
-            button.get_style_context ().add_class ("destructive-action");
-
         if (data != null)
         {
             button.set_data<string> ("calc_text", data);