Correct error when default delay value was being calculated from issue

I was seeing the following:


    1) monit osfamily = RedHat default usage (osfamily = RedHat) should compile
     Failure/Error: should contain_file('/etc/monit.conf')
     Puppet::Error:
       left operand of * is not a number at /Users/chris.boulton/Personal/puppet-module-monit/spec/fixtures/modules/monit/manifests/init.pp:33 on node syd-mbp11.interspire.corp
     # ./spec/classes/monit_spec.rb:18

This ensures `$delay` is calculated after the default class params have been set.