Hidden rows do not show time entires, do not contribute to sums

[kusalananda]

Describe the bug

• Hidden rows do not show time entries.
• The time entries on hidden rows are not used when calculating sums of hours.
• When you unhide a newly logged hidden time entry, the time records disappear

Steps to reproduce

1. Enter time on a row that is hidden.
2. Save changes.
3. Reload.
4. Observe the sum total not changing and no time entries showing on the hidden rows.

Entries are saved and will be visible etc. when the row is un-hidden and the page is reloaded.

Environment

Current develop branch, just after merging #490.

Expected behaviour

When the section with hidden rows is expanded, it should function identically to a starred or other rows. Time entries may be added or modified etc.

The hidden rows should always be used when summing up the hours.