Can't test node-to-node connections using the default "Allow all" ACL example configuration

### What is the issue?

With the default "Allow all" ACL example, I wrote tests to check if two nodes can connection with each other, but the test fails.

### Steps to reproduce

Paste in the following ACL and tests:

```golang
{

// Start default ACL from the examples
// Source: https://tailscale.com/kb/1192/acl-samples?q=example#allow-all-default-acl
"acls": [{
"action": "accept",
"src": [
"*"
],
"dst": [
"*:*"
]
}],
"ssh": [{
"action": "check",
"src": [
"autogroup:member"
],
"dst": [
"autogroup:self"
],
"users": [
"autogroup:nonroot",
"root"
]
}],
// End default ACL

// Define two hosts that will talk to each other
"hosts": {
"alice": "10.10.10.10",
"bob": "10.10.10.10",
},

// Alice should be able to connect to services on Bob
"tests": [{
"src": "alice",
"accept": [
"bob:22", // SSH
"bob:8086", // Proxmox
"bob:80", // HTTP
"bob:443", // HTTPS
],
}, ],
}
```

Observe the following error:

```
Error: test(s) failed
test(s) failed for user: alice

[acl test error]: address "bob:22" (protocol "tcp"): want: Accept, got: Drop
[acl test error]: address "bob:8086" (protocol "tcp"): want: Accept, got: Drop
[acl test error]: address "bob:80" (protocol "tcp"): want: Accept, got: Drop
[acl test error]: address "bob:443" (protocol "tcp"): want: Accept, got: Drop
```

### Are there any recent changes that introduced the issue?

_No response_

### OS

_No response_

### OS version

_No response_

### Tailscale version

_No response_

### Other software

_No response_

### Bug report

_No response_