fix incorrect template content line

manifests/ssh/pam.pp

@@ -19,7 +19,7 @@ class ssh::pam (
     if ($::osfamily =~ /Debian/) {
       file {'/etc/pam.d/sshd':
         ensure => present,
-        source => template('base/ssh/etc/pam.d/sshd.erb'),
+        content => template('base/ssh/etc/pam.d/sshd.erb'),
       }
     } else {
       fail("cannot call ssh::pam with pam_duo true under OS '$::osfamily'")