[BUG] convert to raw missing last day in train

[noahnisbet]

Describe the bug
In convert_to_raw.py in the DLRM sample it seems like the logic is incorrect on the number of days. When creating the list under the function "_get_days_for_stage," list(range(NUM_DAYS - 1)) is returned for the train stage. However, wouldn't this exclude day 23? The range function is already exclusive on the highest value. list(range(NUM_DAYS)) seems like it should be correct.

To Reproduce
Run HugeCTR/samples/dlrm/preprocessing/covert_to_raw.py as described in the documentation.

Expected behavior
Processing all 24 days (0-23)