hub : fix: correctly pass TLVs in NIP-47 pay_keysend (#234)
* fix: correctly pass TLVs in NIP-47 pay_keysend
as per the nip-47 spec, pay_keysend TLV values are hex-encoded
* Update lnclient/greenlight/greenlight.go
Co-authored-by: Roland <33993199+rolznz@users.noreply.github.com>
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Co-authored-by: Adithya Vardhan
https://github.com/getAlby/hub/commit/947f216fd29c40fddbdf938c6faa5ac3377d1de4