[Component] TextField: Add scale factor to corner radius

[LouisBorleeAdevinta]

When the dynamic size changes, the corner radius do not scale with it atm

For example, a corner radius of 4px on a 40px component will be 10% whereas for a 80px it will only be 5% (less rounded)

Here you can see one with the scaling (the most rounded one) and one without

[elisa-hery]

Nice ! Result here (with max size) :

before :

after :