Update Ldap.php

This is a very crude workaround, a better solution is explained in the comments I added.

@@ -18,6 +18,24 @@ class Ldap
      */
     public function connect($hostName, $port)
     {
+        /*
+        * LDAPS is not working because even if port 363 is specified, 
+        * BookStack tries to open a LDAP connection on the LDAPS channel.
+        * The if-clause below fixed this, although it would be better to
+        * change the settings in .env from
+        *   LDAP_SERVER=servername:port
+        * to
+        *   LDAP_SERVER=ldap://servername:389
+        *   LDAP_SERVER=ldaps://servername:363
+        * in order to be compatible with non-standard setups. Currently, 
+        * specifying ldap:// or ldaps:// results in an error because BookStack
+        * splits at ":" and takes the seconds chunk (in this case "//servername"
+        * as the port value.
+        */
+        if ($port == 363)
+        {
+                $hostName = "ldaps://".$hostName;
+        }
         return ldap_connect($hostName, $port);
     }