Exclude database added to backup

[DahmaniAdame]

Describe the bug
Excluded items will be added to backups despite being excluded in the first place.

Initially, the backup correctly contains only files. However, after refreshing the page, a database backup unexpectedly appears in the backup list.

To Reproduce
Scenario:
Perform a fresh install of BackWPup
Exclude database and continue
Database is added to the backup list

Scenario:
Perform a fresh install of BackWPup
Configure the first backup to include files only (excluding just one theme)
Proceed with local storage backup
Database is added to the backup list

Expected behavior

Only the selected file backups should be generated.
No DB backup should be created unless explicitly enabled.
The backup list should not display a DB backup after a refresh if it was not initially included.