Do not escape password for LDAP connectors (#3470)

With the change introduced in https://github.com/dexidp/dex/pull/3372

 Dex declines passwords that contain special characters. Since password is not passed to any kind of filters, it is safe to pass a password as is. No LDAP query injections are possible.

This commit is a revert of password escaping.

Signed-off-by: m.nabokikh <maksim.nabokikh@flant.com>

connector/ldap/ldap.go

@@ -473,7 +473,6 @@ func (c *ldapConnector) Login(ctx context.Context, s connector.Scopes, username,
 	)
 
 	username = ldap.EscapeFilter(username)
-	password = ldap.EscapeFilter(password)
 
 	err = c.do(ctx, func(conn *ldap.Conn) error {
 		entry, found, err := c.userEntry(conn, username)