Add search bind support, fix group_identifier typo, fix empty gidNumber query

- Add search_bind_enabled/search_bind_dn/search_bind_password to allow
  using a dedicated LDAP account for user and group searches. This is
  needed when regular LDAP users lack search permissions (common with
  restrictive ACLs on OpenLDAP).
- Support both group_indentifier (original) and group_identifier config
  keys, falling back to 'cn' if neither is set.
- Skip the gidNumber-based primary group query when the attribute is
  empty, avoiding broken LDAP filters on non-posixAccount setups.

blueprints.yaml

@@ -1,5 +1,5 @@
 name: Login LDAP
-version: 1.2.0
+version: 1.1.0
 description: Allows for Grav user authentication against an LDAP Server such as OpenLDAP or ActiveDirectory
 icon: user-circle-o
 author:

login-ldap.php

@@ -98,7 +98,7 @@ class LoginLDAPPlugin extends Plugin
         $opt_referrals      = $this->config->get('plugins.login-ldap.opt_referrals');
         $blacklist          = $this->config->get('plugins.login-ldap.blacklist_ldap_fields', []);
 
-        // Alternate search user (for when regular users lack search permissions)
+        // Dedicated search bind account (for when regular users lack search permissions)
         $search_bind_enabled  = $this->config->get('plugins.login-ldap.search_bind_enabled', false);
         $search_bind_dn       = $this->config->get('plugins.login-ldap.search_bind_dn');
         $search_bind_password = $this->config->get('plugins.login-ldap.search_bind_password');
@@ -139,7 +139,7 @@ class LoginLDAPPlugin extends Plugin
             // Try to login via LDAP
             $ldap->bind($username, $credentials['password']);
 
-            // Set up search LDAP connection (use separate bind if configured)
+            // Set up search LDAP connection (use dedicated bind if configured)
             if ($search_bind_enabled && $search_bind_dn) {
                 /** @var Ldap $searchLdap */
                 $searchLdap = Ldap::create('ext_ldap', $ldap_config);