bgpd: Use enum bgp_fsm_state_progress for bgp_stop()

```
bgpd/bgp_fsm.c:1360:29: warning: conflicting types for ‘bgp_stop’ due to enum/integer mismatch; have ‘enum bgp_fsm_state_progress(struct peer *)’ [-Wenum-int-mismatch]
 1360 | enum bgp_fsm_state_progress bgp_stop(struct peer *peer)
      |                             ^~~~~~~~
In file included from bgpd/bgp_fsm.c:29:
./bgpd/bgp_fsm.h:111:12: note: previous declaration of ‘bgp_stop’ with type ‘int(struct peer *)’
  111 | extern int bgp_stop(struct peer *peer);
      |            ^~~~~~~~
```

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

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