fix: pass TLV value as hex from nwc webln provider to nwc client keysend #229
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With WebLN keysend TLVs, the value is passed as plaintext:
https://www.webln.guide/building-lightning-apps/webln-reference/webln.keysend
In NIP-47 spec the value should be hex encoded:
https://github.com/nostr-protocol/nips/blob/master/47.md#pay_keysend
This PR fixes the NostrWeblnProvider to pass the TLV values hex-encoded instead of plaintext.