filter "function" does not work in /signal-genes without kind

[daviortega]

This works:

https://api.mistdb.caltech.edu/v1/genomes/GCF_002996345.1/signal-genes?kind=output&function=enzymatic&page=1&per_page=100

This bring all signal-genes:
https://api.mistdb.caltech.edu/v1/genomes/GCF_002996345.1/signal-genes?function=enzymatic&page=1&per_page=100

Expected behavior

It should bring just signal genes with function enzymatic from any kind