staging: rtl8188eu: cleanup whitespace in rtl8188e_dm.c

Replace tabs with spaces and/or remove spaces to use typical kernel
horizontal whitespace.
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20200114134422.13598-5-straube.linux@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>