fix: allow dialing a peer when we only have transient connections

[achingbrain]

If we dial a peer that we already have a connection to, we return that connection instead of dialing.

This creates a problem when we are trying to make a direct connection to a peer that we already have a relay connection to since the relay connection is returned.

The fix here is to allow additional dials to peers when we only have relay connections.

If a direct connection exists, we will still return it instead of dialing.

Change checklist

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation if necessary (this includes comments as well)
• I have added tests that prove my fix is effective or that my feature works