fix: 'ipfs routing findpeer' explicitly fails when searching for self

[susarlanikhilesh]

Closes #9898

[BigLep]

@hacdias : can you provide a quick review please?

[hacdias]

Seems fine, but perhaps a test would be great.

[susarlanikhilesh]

Not sure on how to write a test case for that scenario itself as we need the daemon running while we want to test this command. Any leads would be great.

Thank you

[hacdias]

@susarlanikhilesh you can write a test inside test/cli. Those tests all use a daemon. Perhaps this file would be the best to insert a t.Run("ipfs routing findpeer fails for self", func(t *testing.T) { }) or something like that: https://github.com/ipfs/kubo/blob/master/test/cli/routing_dht_test.go

[susarlanikhilesh]

@hacdias Can you please check if that's sufficient.

[Jorropo]

I guess this works but this seems very ad-hoc.
I think this is covering up a bug, ideally the routing layers like dht, ... would return this error.

This is better than nothing still.

[hacdias]

Thanks for this!