[#5210] Improve detection of marketplace urls for the preloaded marketplace floater

[Hecklezz]

Issue: #5210
Follow up to Dan-Lindens test on Mac: #5210 (comment)

I got a few people to test the original change on their Macs and everything was behaving as expected.
So I suspect the reason why a marketplace url did not open with the preloaded-marketplace floater when Dan-Linden tested, was one of a few reason-

1. The url started with http:// and not https:// (This PR addresses this)
2. The url was simply https://marketplace.secondlife.com without the trailing / (This PR addresses this)
3. Their MarketplaceURL setting is modified (This PR does not address this and they need to default it)

As to why they weren't already logged in to the marketplace, that is out of scope and not a result of the marketplace changes I've made, and would be a result of the cookies not getting loaded or were invalid for some reason.

This PR simply just trims off the https:// or http:// from urls and removes any trailing /'s. That way when it compares against MarketplaceURL which also gets trimmed, it can more accurately determine if it was a marketplace url that is trying to be opened so it can use the preloaded marketplace floater.

[akleshchev]

Thank you!

The rest of the work appears to be in 2026.2, not in develop so I'm, not sure where this is going to land.