Fix: Remove fixed height from tab panels

[fluiddot]

Fix

When navigating to Settings/Display the content was displaying two scroll bars, one set by the dialog content (introduced in this recent PR) and the other by the tab panels component due to having a fixed height.

Since the dialog component is already setting a max height, we don't really need to specify a fixed height in the tab panels so I removed that CSS propery.

Before	After

Test

1. Go to Settings
2. Click on Display
3. Observe that the content can be scrolled and that there's only one scroll bar

Release

N/A

[sandymcfadden]

Good call and catch, thank you!