staging: r8188eu: simplify three_out_pipe

Only one of the mappings in three_out_pipe depends on the wifi_cfg flag.
Simplify the code accordingly.

Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220806195540.777390-10-martin@kaiser.cx


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