Entries from different years are grouped into the same week

[mmcknett]

If the week number is the same, but the years are different, the numbers get added together.

Repro steps:

1. Add a log for 6/16/2024 with a non-zero time period
2. Add a log for 6/16/2023 with a non-zero time period

Expected:

• The two logs should be grouped into different weeks (because they have different years)

Actual:

• The two logs are grouped into the same week and their time statistics are aggregated into that week

Likely cause:

• Week grouping is done purely by week number, and does not include the year when grouping.