fixed password refill in login form when wrong password was given

It's better to not refill the passwords on wrong credentials given.
Standard behaviour on all pages are making the password blank

rhodecode/controllers/login.py

@@ -115,6 +115,9 b' class LoginController(BaseController):'
                     raise HTTPFound(location=url('home'), headers=headers)
 
             except formencode.Invalid, errors:
+                defaults = errors.value
+                # remove password from filling in form again
+                del defaults['password']
                 return htmlfill.render(
                     render('/login.html'),
                     defaults=errors.value,