[ic-toggle-button-group] - height of toggle buttons within groups does not match designs

[lz405]

Summary of the bug

When a toggle button is put into a group, the height of the buttons are inconsistent with designs and buttons outside of a toggle-button-group

🪜 How to reproduce

Tell us the steps to reproduce the problem:

1. Add a toggle button group with toggle buttons inside it
2. Notice the heights of the toggle buttons are inconsistent with figma designs

This also causes issues when they have the 'loading' prop, to recreate:

1. Add a toggle button inside a toggle button group
2. Give the toggle button the loading prop
3. Notice the button that is loading has now changed in height

📸 Screenshots or code

Examples of the toggle button currently

🧐 Expected behaviour

Toggle buttons should remain consistent sizes whether they are in a group or not.