staging: rtl8188eu: remove 5 GHz if test

staging: rtl8188eu: remove 5 GHz if test

Cleanup a line over 80 characters by removing an if test that is valid
only for 5 GHz. According to the TODO 5 GHz code should be removed.

- find and remove remaining code valid only for 5 GHz. Most of the obvious
  ones have been removed, but things like channel > 14 still exist.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20200409080802.16645-1-straube.linux@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>