Update unit tests after removing "this month" and "last month" items
Summary:
since this change https://phabricator.kde.org/D11767 the kio unit tests are
having a regression; if the "This Month" and "Last Month" items are removed,
the corresponding unit tests should be removed along with the change.
Test Plan:
I have tested this patch adding it to kubuntu's packaging
Differential Revision:
https://phabricator.kde.org/D12234