cangw: fix inverse filter display when printing the configured rules

cangw: fix inverse filter display when printing the configured rules

A configured inverse filter e.g.

cangw -A -s can0 -d can1 -e -f 123~7FF

has been displayed with 'cangw -L' like this:

cangw -A -s can0 -d can1 -e -f 20000123:7FF # 0 handled 0 dropped 0 deleted

While 0x20000000 was the value of CAN_INV_FILTER.

This patch fixes the output to the expected display:

cangw -A -s can0 -d can1 -e -f 123~7FF # 0 handled 0 dropped 0 deleted

Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>