staging: rtl8192e: rename RT2RT_HT_Mode to rt2rt_ht_mode in bss_ht struct

Rename RT2RT_HT_Mode to rt2rt_ht_mode to silence a checkpatch warning
about CamelCase.

Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: William Durand <will+git@drnd.me>
Link: https://lore.kernel.org/r/20210220172909.15812-12-will+git@drnd.me
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>