tests: Drop unneeded segment-routing from c22 config

`segment-routing` statement in `c22/frr.conf` is unneeded as there is
no config under it. Remove it to improve the readability of the config
file.

Signed-off-by: Carmine Scarpitta <cscarpit@cisco.com>

Author: cscarpitta

tests/topotests/bgp_srv6_sid_explicit/c22/frr.conf

@@ -10,9 +10,4 @@ interface eth10
  ip address 192.168.2.1/24
  ipv6 address 2001:2::1/64
 exit
-!
-segment-routing
- traffic-eng
- exit
-exit
 !