ath6kl: Remove unnecessary recovery state check in ath6kl_recovery_hb_timer()

Checking for recovery state just before re-arming hb_timer is not
necessary, this should be done at the begining of the timer instead.

Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>