Bug with encrypt function

Hi,

Thank you for a great plugin.

I think there is a small issue with your encrypt method of Mo_Ldap_Local_Util class.

If the service account password contains a single quote per se, str argument that is passed to encrypt method has an escaped version of the password (which is different from the original password)

e.g. 7805d2R'$H turns into 7805d2R\'$H when it is passed to encrypt method.

https://ww.wp.xz.cn/plugins/ldap-login-for-intranet-sites/