When removing date type, it should remove the date values from the filter bar

[carolinemwood]

Describe the Bug
When clearing just the date type from the filter bar, it is expected that the date values are also cleared, but it is not.

Expected Behaviour
When clearing just the date type from the filter bar, it is expected that the date values are also cleared

Actual Behaviour
Dates are still present after the date type is removed

[carolinemwood]

Behaviour was first observed on Pull request #495

[paulushcgcj]

Fixed as part of #539