executor: use any executor if the avoid mask included all of them

After 9fc8fe026baa ("executor: better handling for hanged test
processes"), yz-executor's responses may reference procids outside of
the [0;procs] range.

If procids are no longer dense on the syz-executor side, we cannot rely
on this check in pkg/rpcserver:
```
	if avoid == (uint64(1)<<runner.procs)-1 {
		avoid = 0
	}
```

Signed-off-by: Andrei Vagin <avagin@google.com>

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