Take in consideration history storage period with 0 on housekeep override

Steps to reproduce:

1. Housekeeping override of History to 7d (because of TimescaleDB)
2. Create an item with History storage period of 0 (zero)

Result:

The items configured history storage period of 0 is overridden by the global 7d.

Expected:

Even if this is plausible for most cases, IMO for the 0 value this should be considered as non-overrideable.

For example if you configure the master element for an Prometheus scrape and set it to 0 because there is alot of data you realy dont want to store them for 7d!

I think, this even was as expected in previous versions?