harden: key remembered site permissions by full origin (closes #402)

allowedSites and deniedSites held the bare hostname, so a grant to
https://dapp.example also authorised http://dapp.example and every port
on that host, and the connection, transaction and signature prompts
named only the hostname. Both lists now store and match the full origin
(scheme://host[:port]), the key the connections approved without
Remember already used. The prompts, the Settings site lists and
AUTISTMASK_REMOVE_SITE use the origin too. Entries saved by hostname
are not migrated (pre-1.0): they match no site.

Model: opus-5-5

tests/support/popupBoot.js

@@ -71,7 +71,7 @@ function unversionedValidProfile(extra) {
         networkId: "mainnet",
         rpcUrl: "https://ethereum-rpc.publicnode.com",
         blockscoutUrl: "https://eth.blockscout.com/api/v2",
-        allowedSites: { [ADDRESS]: ["dapp.example"] },
+        allowedSites: { [ADDRESS]: ["https://dapp.example"] },
         deniedSites: {},
         trackedTokens: [],
         theme: "system",