getSortQuery in pleco-knex does not mutate query

[the-chosen-one]

When using the getSortQuery from pleco-knex when making a call with the { mutate: true } flag the original query is not mutated. Instead of calling

getSortQuery({ sort, subqueries }, { knex: this.knex, query, mutate: true })

to change the query, we must now do this:

query = getSortQuery({ sort, subqueries }, { knex: this.knex, query, mutate: true })

[thekuom]

I'm interested to see if we would have to re-evaluate the sorting strategy. What the function is doing now is it wraps the original query with another query and then returns. Unlike the filtering function which never re-assigns the query param