base-files/leds: save led color value if available

base-files/leds: save led color value if available

There are monochrome LEDs that can only display one color. However, there
are also LEDs that can display multiple colors. This can be tested in the
led subsystem of the kernel if the files 'multi_index' and 'multi_intensity'
are present in the folder '/sys/class/leds/<ledname>'.

Until now it was not possible to reset the default color. This commit adds
the missing information in the file '/var/run/led.state' so that the bootup
color can be seen on the LED again when the LED configuration has been changed.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>