[BUG] Filter By Category Does not work

[Amichael10]

Describe the bug
The category filter on the Potlock web app is not functioning as intended. When users attempt to apply a category filter, the expected results are not displayed, leading to confusion and frustration.

To Reproduce
Steps to reproduce the behavior:

1. Go to the Potlock web app homepage.
2. Scroll to all Project
3. Click on Filter, then the " Filter by Categories" dropdown menu.
4. Select any category from the list.

Observe that the results do not update to reflect the selected category.

Expected behavior

When a category is selected from the filter, the displayed items should be updated to show only those that belong to the chosen category. Instead, the app shows an empty list.