Keep the usersearch condition the same as before

kafka-ui-api/src/main/java/com/provectus/kafka/ui/config/auth/LdapSecurityConfig.java

@@ -57,7 +57,7 @@ public class LdapSecurityConfig {
     if (props.getBase() != null) {
       ba.setUserDnPatterns(new String[] {props.getBase()});
     }
-    if (props.getUserFilterSearchBase() != null) {
+    if (props.getUserFilterSearchFilter() != null) {
       LdapUserSearch userSearch =
           new FilterBasedLdapUserSearch(props.getUserFilterSearchBase(), props.getUserFilterSearchFilter(),
               contextSource);