wifi: ath12k: ath12k_mac_op_sta_state(): clean up update_wk cancellation

wifi: ath12k: ath12k_mac_op_sta_state(): clean up update_wk cancellation

Now that we have switched to using wiphy_lock() there's no need to have
update_wk cancel call separately, for consistency move it to the rest of code
handling IEEE80211_STA_NONE state.

No functional changes.

Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3

Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://patch.msgid.link/20241007165932.78081-7-kvalo@kernel.org
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>