[BUG] Pins are not supposed to be inherited anymore, but inherited pins show up when pinning content further down

[spaenleh]

This is an issue related to legacy behaviour that has not been completely removed.

Expected behaviour

When pinning an item in a folder, it will be shown inside the side panel for the current page/folder only.
The pins should not be inherited anymore.

Reproducing the issue

1. Create a parent folder "A".
2. Create 2 text elements, one says "I am pinned from A" the other "I am regular"
3. create 2 child folders "B1" and "B2".
4. Inside B1, create a text element "text in B1"
5. Inside B2, create 2 text elements "I am pinned from B2" and "I am regular from B2"

Current behaviour:

• "I am pinned from A" is showing in the pinned elements when viewing A
• There are no pinned elements in B1
• "I am pinned from A" is showing in the pinned elements when viewing B2 -> this should not be shown in B2
• "I am pinned from B2" is showing in the pinned elements when viewing B2

Expected behaviour: Only pinned children from the current folder should be shown in the pinned tab. Pinned elements from parents should not be shown in children elements.