Remove .wasm file extension before redefining it

[campersau]

I had to remove the .wasm file extension because IIS was complaining about duplicate entries in order to make it work with br and https.

Others also reported this issue on stackoverflow:
https://stackoverflow.com/a/69888016
https://stackoverflow.com/a/70967738

[guardrex]

Thanks @campersau 🚀 ... and note that this whole node of topics (Host and Deploy) is due for an overhaul and series of updates per #24615. I've cross-linked the tracking issue to this PR and to the SO posts that you mentioned for when I test and improve the guidance.

I think one of the things that I'll do where it tells readers that the example web.config file is a starting point for further customization is to call out our list of recommended public support channels (SO, Slack, Gitter). I'll probably include a tag filter in the SO link (https://stackoverflow.com/questions/tagged/blazor+iis+compression).

Thanks for sending this PR.