TT#122202 Re-enable use_session for realm api_subscriber_jwt

Otherwise v1 session (cookies-based) is not created and v2 CSC
cannot load v1 "iframe" content. Also it was impossible to switch
between v1 and v2 CSC.

Change-Id: Iab3fac6e8da6e5a2e81a0626a3db6faa3e011396
(cherry picked from commit 3ba08f45ac)

lib/NGCP/Panel.pm

@@ -275,7 +275,6 @@ __PACKAGE__->config(
                 user_model => 'DB::provisioning_voip_subscribers',
                 store_user_class => 'NGCP::Panel::Authentication::Store::RoleFromRealm',
             },
-            use_session => 0,
         },
         api_admin_jwt => {
             credential => {