bug: identity keys domain should be host without protocol or path

[chris13524]

I will begin to validate these fields in notify server soon

https://github.com/WalletConnect/walletconnect-utils/blob/f2222ea434be082ab915cb9936e00b636de8fbe7/misc/identity-keys/src/identity-keys.ts#L77

https://specs.walletconnect.com/2.0/specs/servers/keys/identity-keys#message-format

Domain = keys.walletconnect.com URI = https://keys.walletconnect.com/