TASK: Remove obsolete policy for removed temporary login controller

Followup for #93 which left the policy for the `PackageFactory\Guevara\Controller\LoginController` from the beginning of the revolution introduced with ce1f78c

The line was later renamed and thus this zombie was created.

Configuration/Policy.yaml

@@ -6,9 +6,6 @@ privilegeTargets:
 
   'Neos\Flow\Security\Authorization\Privilege\Method\MethodPrivilege':
 
-    'Neos.Neos.Ui:BackendLogin':
-      matcher: 'method(Neos\Neos\Ui\Controller\LoginController->(index|authenticate)Action()) || method(Neos\Flow\Security\Authentication\Controller\AbstractAuthenticationController->authenticateAction())'
-
     'Neos.Neos.Ui:Backend.GeneralAccess':
       matcher: 'method(Neos\Neos\Ui\Controller\BackendController->.*())'
 
@@ -22,12 +19,6 @@ privilegeTargets:
 
 roles:
 
-    'Neos.Flow:Everybody':
-      privileges:
-        -
-          privilegeTarget: 'Neos.Neos.Ui:BackendLogin'
-          permission: GRANT
-
     'Neos.Neos:AbstractEditor':
       privileges:
         -