Tennessee state route shields have repetitive entries in legend

[1ec5]

Tennessee’s primary and secondary state route shields have separate entries in the legend, but since these are two shields for the same network, Wikidata has only a single item associated with both network=US:TN:primary and network=US:TN:secondary, resulting in a redundant entry:

The legend should combine these rows into a single row with two shields on it, just as it does in other cases where there are multiple shields within the same shield definition.

[1ec5]

As a counterpoint, Puerto Rico similarly has multiple shields for the same network based on classification, but each classification has its own Wikidata item, such as for secondary roads. This would be a better long-term approach for providing more specific captions in each language, but combining the entries would be less silly in the meantime.