Destroy search window before creating the new form window

Because of the flag DIALOG_DESTROY_WITH_PARENT, the search window can not be
destroyed by the callback of the form window because the form window is also
destroyed too early.

issue2522

tryton/gui/window/win_search.py

@@ -118,7 +118,7 @@ class WinSearch(NoModal):
                     record = screen.current_record
                     res = [(record.id, record.value.get('rec_name', ''))]
                     self.callback(res)
-                    self.destroy()
+            self.destroy()
             WinForm(screen, callback, new=True)
             return
         if res: