staging: r8188eu: RSSI_test is always false

The field RSSI_test of struct odm_dm_struct is never set. It stays
at the default value 0. Remove it and remove a related if test that
is always true.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20211228101120.9120-10-straube.linux@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>