Fix disabling transmission limit for volume limit type

[koen-vg]

A simple little fix; we were looking up the names of transmission limits incorrectly so disabling the limit only worked for cost limits, not volume limits

Checklist

• I tested my contribution locally and it seems to work fine.
• Code and workflow changes are sufficiently documented.
• Changed dependencies are added to envs/environment.yaml.
• Changes in configuration options are added in all of config.default.yaml.
• Changes in configuration options are also documented in doc/configtables/*.csv.
• A release note doc/release_notes.rst is added.