Modifying Enable-DscEventLog to be exportable

[ArtWDrahn]

Breaking up my commits into seperate PRs without any white space changes. Should be easier to review. 👍

[dlwyatt]

There are a couple of problems here. There's a call to Enable-DscEventLog elsewhere in the code (from Test-DscEventLogStatus) that you need to update as well, since Enable-DscEventLog now uses parameters instead of looking up the value of Script variables.

Also, there's still a bit of code inside the new Enable-DscEventLog which is looking at $script:ThisCredential instead of the new $Credential parameter.

[dlwyatt]

Looks like the first issue might be covered in your other PR, though; I'll look at that next.

[ArtWDrahn]

I fixed the bug where I wasn't checking for $Credentials, thanks for the catch!

[vors]

@ArtWDrahn 👍