wifi: rtw89: coex: Clear BT link weight when BT is disabled

When a BT device is disabled, _update_bt_link_cnt() is no longer called
for that device, so its link_weight[] retains stale values from the last
active period. _set_bind_info() then computes a non-zero band score for
the disabled device, which can lead to an incorrect tdd_bind.rf_band
selection and ultimately wrong coexistence policy.

Clear link_weight[] for any disabled BT device at the start of the
_set_bind_info() loop so that stale scores are not carried forward.

Signed-off-by: Ching-Te Ku <ku920601@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20260730060220.55844-4-pkshih@realtek.com

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