Fix set_value for widget calendar search

tryton/gui/window/view_form/widget_search/calendar.py

@@ -80,7 +80,8 @@ class Calendar(Interface):
         return res
 
     def _value_set(self, value):
-        pass
+        self.entry1.set_text(value)
+        self.entry2.set_text(value)
 
     value = property(_value_get, _value_set, None,
             _('The content of the widget or ValueError if not valid'))