Revert new TLD expression.

I can already see how many times it will receive false positives for filenames, so reverting.
As URLs with a scheme already support wildcard TLDs, I am not worried about future expansion.
The only thing limited are generic matches without a URL scheme.

Example: “http://textual.app/“ already is linkified but “textual.app” is not.
Provide support for more magnet links.