Unify search bar position (top) on instance list

[LuniMoon]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

Based on Rasterisko's post on the topic request who noticed it:

Solution:

Move the search bar to the top of the instance panel like the other panels :)

Steps to reproduce

N/A

GDevelop platform

Desktop, Web, Mobile

GDevelop version

N/A

Platform info

OS (e.g. Windows, Linux, macOS, Android, iOS)

OS Version (e.g. Windows 10, macOS 10.15)

Browser(For Web) (e.g. Chrome, Firefox, Safari)

Device(For Mobile) (e.g. iPhone 12, Samsung Galaxy S21)

Additional context

N/A