Fix close button image for issue204

share/tryton/tryton.glade

@@ -3786,7 +3786,7 @@ Each version is given a distinguishing version number.  If the Program specifies
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="can_default">True</property>
-                <property name="label">tryton-close</property>
+                <property name="label">gtk-close</property>
                 <property name="use_stock">True</property>
                 <property name="response_id">-7</property>
                 <signal name="clicked" handler="on_but_ok_pressed"/>
@@ -5381,7 +5381,7 @@ Latin1</property>
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="can_default">True</property>
-                <property name="label">tryton-close</property>
+                <property name="label">gtk-close</property>
                 <property name="use_stock">True</property>
                 <property name="response_id">-7</property>
               </widget>