bridge: fdb: don't colorize the "dev" & "dst" keywords in "bridge -c fdb"

bridge: fdb: don't colorize the "dev" & "dst" keywords in "bridge -c fdb"

To be consistent with the colorized output of "ip" command and to increase
readability, stop highlighting the "dev" & "dst" keywords in the colorized
output of "bridge -c fdb" cmd.

Example: in the following "bridge -c fdb" entry, only "00:00:00:00:00:00",
"vxlan100" and "2001:db8:2::1" fields should be highlighted in color.

00:00:00:00:00:00 dev vxlan100 dst 2001:db8:2::1 self permanent

Signed-off-by: Gokul Sivakumar <gokulkumar792@gmail.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>