EscapeFilter the group dn membership (#20200)
EscapeFilter the group dn membership (#20200)

The uid provided to the group filter must be properly escaped using the provided
ldap.EscapeFilter function.

Fix #20181

Signed-off-by: Andrew Thornton <6a547fdd28db89120bdd70d4af1f9ba672ccd43a@cantab.net>

go-gitea/gitea,go-gitea/gitea,go-gitea/gitea