[simple-scan] Add colour to scan button

[Robert Ancell <rancell src gnome org>]

commit 5f29ecd6cb7a664621ec417598d067edf941ab65
Author: Robert Ancell <robert ancell canonical com>
Date:   Tue May 23 10:21:45 2017 +1200

    Add colour to scan button

 src/app-window.ui |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/app-window.ui b/src/app-window.ui
index ec6add6..e5d6cad 100644
--- a/src/app-window.ui
+++ b/src/app-window.ui
@@ -701,6 +701,7 @@
                 <signal name="clicked" handler="stop_scan_button_clicked_cb" swapped="no"/>
                 <style>
                   <class name="text-button"/>
+                  <class name="destructive-action"/>
                 </style>
               </object>
               <packing>
@@ -720,6 +721,7 @@
                 <signal name="clicked" handler="scan_button_clicked_cb" swapped="no"/>
                 <style>
                   <class name="text-button"/>
+                  <class name="suggested-action"/>
                 </style>
               </object>
               <packing>