Revert "fix: allow HTTP LNURL for RFC1918/loopback baseurls (#2)"

This reverts commit 66026ab.

Closes #2 as resolved by switching the dev LNbits to TLS
(self-signed cert) instead of carving out plain HTTP for
RFC1918 hosts. With HTTPS the producer-side python-lnurl
validation accepts any host, AND the lnbits-core consumer-side
`lnurlscan` accepts it too — the symmetric problem the carve-out
couldn't solve on its own.

`create_lnurl_from_baseurl` (#1, `e9d911e`) is kept — it's
orthogonal to the transport scheme and still wanted for the
nostr-transport `lnurl=null` fix.

transport_rpcs.py

@@ -211,7 +211,9 @@ def _populate_lnurl(link: WithdrawLink) -> WithdrawLink:
     duplicating state LNbits already knows. See aiolabs/withdraw#1.
     """
     try:
-        link.lnurl, link.lnurl_url = create_lnurl_from_baseurl(link)
+        encoded = create_lnurl_from_baseurl(link)
+        link.lnurl = str(encoded.bech32)
+        link.lnurl_url = str(encoded.url)
     except ValueError:
         pass
     return link