staging: rtl8723bs: Remove function rtw_set_scan_deny_timer_hdl()

Remove function rtw_set_scan_deny_timer_hdl as all it does is call
rtw_clear_scan_deny.
Modify call sites of rtw_set_scan_deny_timer_hdl to call
rtw_clear_scan_deny instead.
Issue found with Coccinelle.

Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>