[space] Using the search bar in main page shows ALL materials #1311

Describe the bug

Searching in space shows ALL materials – including the parent space.

To Reproduce

Steps to reproduce the behavior:

1. Go to the space home page, click on search
2. You are in <space-url>/search?q= and you see ALL the training materials
3. But when you click on 'View all results & filter' you only see the space materials

Expected behavior

<space-url>/search?q= should show only the space materials.

Screenshots