Fix blockreassurance and promo code layout

[maximebiloe]

Questions	Answers
Branch?	develop
Description?	Fix blockreassurance and promo code layout in Classic
Type?	bug fix
Category?	FO
BC breaks?	no
Deprecations?	no
How to test?	Just open your eyes 👀

[Shudrum]

Please try to use a better nesting. (On another PR as a refacto type)

li {
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);

  &:last-child {
    border: 0;
  }

  > .block-reassurance-item {
    padding: em(15px);
  }
}