wifi: ath10k: remove ath10k_htc_record::pauload[]

The misspelled pauload member of struct ath10k_htc_record is unused,
so remove it.

Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20231127-flexarray-htc_record-v1-1-6be1f36126fd@quicinc.com