feat(ui): Design fix for v3 buttons

Related to #424 (closed)

What does this MR do and why?

Fixed the padding for all size of buttons. These are now set to 4px, so all the designs match the Figma.

changed milestone to % [Rés'in] - v3.0.0 - Refonte Graphique

assigned to @pecarlat

approved this merge request

unapproved this merge request

merged

mentioned in commit 7023b865