[simple-scan] Remove trailing whitespace

[Robert Ancell <rancell src gnome org>]

commit 80b3c6868a4877ff0a7d684ce1d5b1ce98f303e2
Author: Robert Ancell <robert ancell canonical com>
Date:   Mon Jan 6 10:08:42 2020 +1300

    Remove trailing whitespace

 src/help-overlay.ui | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/help-overlay.ui b/src/help-overlay.ui
index 8cc3e78..b1a0127 100644
--- a/src/help-overlay.ui
+++ b/src/help-overlay.ui
@@ -148,7 +148,7 @@
               </object>
             </child>
           </object>
-        </child>        
+        </child>
       </object>
     </child>
   </object>