Use the right record to set wizard button state

When the wizard receive the record-modified signal, current_record is not yet
set on the screen so we must use the record from the signal to set the button
state.

issue4171
review7581002

tryton/gui/window/view_form/screen/screen.py

@@ -277,8 +277,8 @@ class Screen(SignalEvent):
             if hasattr(view, 'group_list_changed'):
                 view.group_list_changed(group, signal)
 
-    def _record_modified(self, group, signal, *args):
-        self.signal('record-modified')
+    def _record_modified(self, group, signal):
+        self.signal('record-modified', signal)
 
     def _group_changed(self, group, record):
         if not self.parent:

tryton/gui/window/wizard.py

@@ -150,8 +150,7 @@ class Wizard(object):
         button.show()
         return button
 
-    def _record_modified(self, screen, signal):
-        record = screen.current_record
+    def _record_modified(self, screen, record):
         for button in self.states.itervalues():
             button.state_set(record)