staging: r8188eu: txpktbuf_bndy does not depend on wifi_spec

Remove the if clause that sets txpktbuf_bndy. Both branches set the same
value.

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/20220806194304.777059-1-martin@kaiser.cx


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