fix(setup) Exclude winstations from invisible user search

We cannot use objectClass for this as they may be missing, so we exclude
 uids ending with $.

issue #2895

setup/class_setupStepMigrate.inc

@@ -546,6 +546,7 @@ class setupStepMigrate extends setupStep
         ')'.
         '(!(objectClass=inetOrgPerson))'.
         '(uid=*)'.
+        '(!(uid=*$))'.
       ')',
       ['sn','givenName','cn','uid']
     );