HSTS current state is not detected properly

[matt-richardson]

When enabling HSTS on a server that is already configured with the requested settings:

    cOctopusServer "Configure Octopus Server" {
      Ensure                           = "Present"
...
      HSTSEnabled                      = $true
      HSTSMaxAge                       = 31536000
...
    }

The output shows:

(FOUND MISMATCH) Configuration parameter  'HSTSMaxAge' with value 'False' mismatched the specified value '31536000'
(FOUND MISMATCH) Configuration parameter  'HSTSEnabled' with value 'False' mismatched the specified value 'True'

The show-configuration outputs:

<set key="Octopus.WebPortal.HttpStrictTransportSecurityEnabled">True</set> 
<set key="Octopus.WebPortal.HttpStrictTransportSecurityMaxAge">31536000</set> 

it appears the code is checking the wrong parameters, and also doing a [System.Convert]::ToBoolean(...) on the max age.