Change variable for hmac from server to client

in the openssh client configuration a server variable was used.

roles/ansible-ssh-hardening/templates/openssh.conf.j2

@@ -64,7 +64,7 @@ StrictHostKeyChecking ask
 # Weak HMAC is sometimes required if older package versions are used
 # eg Ruby's Net::SSH at around 2.2.* doesn't support sha2 for hmac, so this will have to be set true in this case.
 #
-{% if ssh_server_weak_hmac -%}
+{% if ssh_client_weak_hmac -%}
     {% if ansible_distribution == 'Ubuntu' and ansible_distribution_version >= '14.04' -%}
         MACs {{macs_66_weak}}
     {% elif ansible_os_family in ['Oracle Linux', 'RedHat'] and ansible_distribution_major_version <= '6' -%}