luci-mod-status: fix neighbour display

luci-mod-status: fix neighbour display

The neighbour display parses the output of 'ip -4 neigh show' e.g.

192.168.219.95 dev eth1 lladdr 38:b4:d3:c9:b2:0c REACHABLE
192.168.219.200 dev eth1 lladdr 04:c4:61:12:f2:d2 STALE

Using regexp /^([0-9a-f:.]+) (.+) (\S+)$/  Unfortunately there's a
space character that sneaks in at the end of line, so let's make this
less brittle by accepting lines that may end with spaces e.g.

/^([0-9a-f:.]+) (.+) (\S+) *$/

Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>