fix: mobile search advanced hidden

[alexbarnsley]

Summary

https://app.clickup.com/t/mx85jh

Checklist

• I checked my UI changes against the design and there are no notable differences
• I checked my UI changes for any responsiveness issues
• I checked my UI changes in light AND dark mode
• I checked my (code) changes for obvious issues, debug statements and commented code
• I opened a corresponding card on Clickup for any remaining TODOs in my code
• I added a short description on how to test this PR (if necessary)
• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

[alexbarnsley]

@ItsANameToo @samharperpittam could you have a look at this please when you get a chance. I've changed it so there's no bottom padding/spacing on devices < 768. This might nee to be approved as it strays from the design

[ItsANameToo]

@alexbarnsley you don't really notice that lack of padding, but results in the button not being pushed up as soon as before :oleglala:

[leMaur]

@alexbarnsley It seems good to me!