Cockroach adapter uses wrong type for dueDate

Steps to reproduce:

1. Add dueDate filter with TODAY value
2. Change dueDate filter to exact date

When dueDate filter is changed, the app shows error `unsupported comparison operator: = ANY `

This is the dueDate condition in the query `(task.data#>>'{dueDate}' = ANY(ARRAY[]::jsonb[])`

The root cause of this is the fact, that the adapter does take into account type of the field. Filter provides `[undefined, null]`as filter value which is converted to `ANY(ARRAY[]::jsonb[])`