bgpd: Align `show bgp ...` output with the header for wide option

bgpd: Align `show bgp ...` output with the header for wide option

Before:

```
r1# sh ip bgp wide
BGP table version is 1, local router ID is 192.168.2.1, vrf id 0
Default local pref 100, local AS 65001
Status codes:  s suppressed, d damped, h history, * valid, > best, = multipath,
               i internal, r RIB-failure, S Stale, R Removed
Nexthop codes: @NNN nexthop's vrf id, < announce-nh-self
Origin codes:  i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

   Network                                      Next Hop                                  Metric LocPrf Weight Path
 *  172.16.255.254/32                            192.168.2.2                                    0             0 (65003) i
 *>                                              192.168.1.2                                    0             0 (65002) i

Displayed  1 routes and 2 total paths
r1#
```

After:

```
r1# sh ip bgp wide
BGP table version is 1, local router ID is 192.168.2.1, vrf id 0
Default local pref 100, local AS 65001
Status codes:  s suppressed, d damped, h history, * valid, > best, = multipath,
               i internal, r RIB-failure, S Stale, R Removed
Nexthop codes: @NNN nexthop's vrf id, < announce-nh-self
Origin codes:  i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

    Network                                      Next Hop                                  Metric LocPrf Weight Path
 *  172.16.255.254/32                            192.168.2.2                                    0             0 (65003) i
 *>                                              192.168.1.2                                    0             0 (65002) i

Displayed  1 routes and 2 total paths
r1#
```

Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>