Don't refresh mintupdate if the Preferences weren't changed

[kneekoo]

Describe the bug
The Preferences window triggers a mintupdate refresh even if you didn't change anything.

Expected behavior
This is not OK, as it can happen that you double-check your settings after you (de)selected some packages and a refresh will reset your selection. On top of this, only the blacklist influences the list of updates, so no other feature should trigger the refresh.

Distribution:

• Linux Mint 19.3

Software version:
5.5.9

[LinuxOnTheDesktop]

This sort of is a bug, because it is an inefficiency (and one that can make the user wait).

[github-actions]

This issue has been automatically marked as stale because it has not had
any activity in over 2 years.

If this issue is still relevant:

• Please test on a current version of this package.
• Add a comment with your findings

If no activity occurs in the next 30 days, this issue will be
automatically closed. Issues can be reopened if needed.

[kneekoo]

This is still a (verified) problem in:

• Linux Mint 21.3 (mintUpdate 6.0.9)
• Linux Mint 22.3 (mintUpdate 7.1.4)