isisd: Remove circuit state check for openfabric

If we have something like:

```
int eth1
 ip router openfabric x
 ipv6 router openfabric x
```

And eth1 is removed, the first `ip router ...` fails and only `ipv6 router ...`
is enabled.

If we leave only:

```
int eth1
 ipv6 router openfabric x
```

Then also, no interface is going to be enabled, which is weird too.

Fixes: https://github.com/FRRouting/frr/issues/17075

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

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