openssh: actually build openssh-server-pam with pam support

Signed-off-by: Sibren Vasse <github@sibrenvasse.nl>

net/openssh/Makefile

@@ -36,7 +36,6 @@ define Package/openssh/Default
 	MAINTAINER:=Peter Wagner <tripolar@gmx.at>
 	URL:=http://www.openssh.com/
 	SUBMENU:=SSH
-	VARIANT:=without-pam
 endef
 
 define Package/openssh-moduli
@@ -89,6 +88,7 @@ define Package/openssh-server
 	DEPENDS+= +openssh-keygen +OPENSSH_LIBFIDO2:libfido2
 	TITLE+= server
 	USERID:=sshd=22:sshd=22
+	VARIANT:=without-pam
 endef
 
 define Package/openssh-server/config