Remove trailing spaces from the user name in the login window

Since e19329d25a6f user login field prevents trailing or leading spaces so the
clients can remove them from the login window.

Closes #13898

sao/src/session.js

@@ -298,7 +298,7 @@
         };
 
         var login = function() {
-            var login = dialog.login_input.val();
+            var login = dialog.login_input.val().trim();
             var database = database || dialog.database_select.val() ||
                 dialog.database_input.val();
             dialog.modal.find('.has-error').removeClass('has-error');

tryton/tryton/gui/window/dblogin.py

@@ -703,7 +703,7 @@ class DBLogin(object):
             CONFIG['login.db'] = database
             CONFIG['login.expanded'] = self.expander.props.expanded
             if response == Gtk.ResponseType.OK:
-                authentication = self.entry_login.get_text()
+                authentication = self.entry_login.get_text().strip()
                 CONFIG['login.login'] = authentication
                 CONFIG['login.service'] = ''
             else: