Fix the function of show more notifications

[XinSkyrim]

Description

Fix the function of show more notification. Now every time a target notification is deleted, if the cumulative number of notifications is greater than 5 then the display list will always show the 5 most recent notifications.

Checklist

• [ ] Ran the Black Formatter and djLint-er on any new code (checks will fail without)
• [ ] Made any changes or additions to the documentation where required
• [ ] Changes generate no new warnings/errors
• [ ] New and existing unit tests pass locally with my changes

What type of PR is this?

• 🐛 Bug Fix

Added/updated tests?

• 🙅 no, because they aren't needed

Related PRs, Issues etc

• Related Issue #https://github.com/TreyWW/MyFinances/issues/559