wifi: rtw89: coex: fix configuration for shared antenna for 8922A

WiFi 2x2 + BT combo cards can be two or three physical antenna. For two
antenna case, one antenna is shared by WiFi and BT, and different
configuration should be applied. Fix the typo.

This problem was found by Coccicheck, and actually that is a typo instead:

  rtw8922a.c:2235:2-4: WARNING: possible condition with no effect (if == else)

Fixes: 652c9642

 ("wifi: rtw89: coex: add init_info H2C command format version 7")
Closes: https://lore.kernel.org/linux-wireless/20240308074539.04512f66@kernel.org/
Cc: Ching-Te Ku <ku920601@realtek.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/20240309001348.9906-1-pkshih@realtek.com