fix(upnp): skip port mapping when an active port mapping is present

[RolandSherwin]

Description

This commit aims to fix a bug where a valid listener would be thrown away without attempting a port map. This happens when we have multiple local adapters and the local adapter with the upnp support is not the first one obtained via NewListenAddr.
With the new change, we would only skip the listen addr if an Active Mapping exists for that same

Change checklist

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• A changelog entry has been made in the appropriate crates

[jxs]

LGTM! Thanks, let me fix the CI first on another PR