Webui roles table sorting treats 0 entries as largest values.

Currently, the webui roles table displays dashes ("-") for zero entries to ease readability of non-zero entries, however this alters the column sorting behavior to treat these entries as larger than any number. The expected behavior is to have the "-" entries be treated as zero.

Ideally we can fix this without having to stick zeroes everywhere and reduce the readability of the table.