Update Select-OSDCloudFileWim.ps1

[HeeringsNET]

Added an 'ElseIf' so the image gets automatically selected if there is only one file found. This is useful when running OSDCloud with the 'ZTI' parameter and without user interaction.

[OSDeploy]

I appreciate you contributing and adding this, but there are a few issues.
First, this functionality is part of OSDCloud v1, which development has stopped so that we can focus on the next release of OSDCloud, which will be previewed later this month.
Secondly, I won't be able to test this PR until after I return from vacation, so April will be the earliest.
Finally, I don't consider this is a high priority as it does not impact many people, so this may sit pending review.

Sadly, this PR is in a bad place. I'm not saying this won't be reviewed, but I want to set the expectation. This configuration has been in place for years without needing to be addressed until now, so that makes me lean towards holding off on this chance.

I'll add that this is OSDCloud v1, which will probably not function after the end of the year, meaning you'll need to be using the newest version of OSDCloud. As of this time, there have not been plans to support this method of deployment. You guys that let this run automated don't give much feedback, and its hard to measure with you being so silent, so to me as the dev, it looks like noone is using this deployment method,

I'm marking this as won't fix for now, but will leave open so I can wait for your comments.

David