cryptonote_basic: fix add_extra_nonce_to_tx_extra() length #10220
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Serialization/deserialization code in$[128, 256)$ , these two sections diverge. This commit amends
tx_extra.htreats the nonce length as a varint, butcryptonote::add_extra_nonce_to_tx_extra()writes the nonce length as a raw unsigned 8-bit integer. For nonce sizes incryptonote::add_extra_nonce_to_tx_extra()to match the serialization code.Issue identified by the Monero Oxide project and reporters.