Refactor padding calculations to use unquote for better compatibility

[Ivanov-Anton]

Motivation

when I use Ruby on Rails 7 and sass-rails 6.0.0 gem I have error SassC::SyntaxError

Expected SassC::SyntaxError when compiling max(var(...)) as SCSS

for example style that lead to error

.style-name {
        right: max(var(--ts-pr-caret), 8px);
      }

style that not lead to error

.style-name {
        right: unquote('max(var(--ts-pr-caret), 8px)');
      }

[Ivanov-Anton]

@nwalters512, can you review this commit? Thank you.