[SDK] Entering letter spacing values wrong

[lwnoble]

Problem/Concern

Currently, we are setting letter-spacing values to a percentage, but they need to be pixels.

Proposed Solution

Here is what the values should be by default. I have updated the TB.css file, but it is overwritten by values coming from the SDK.

--body1LetterSpacing: calc(.02 * var(--body1FontSize));
--body1-boldLetterSpacing: calc(.02 * var(--body1FontSize));
--body2-boldLetterSpacing: calc(.0175 * var(--body2-boldFontSize));
--body2LetterSpacing: calc(.0175 * var(--body2-boldFontSize));
--body3-boldLetterSpacing: calc(.0225 * var(--body3-boldFontSize));
--subtitle1LetterSpacing: calc(.02 * var(--subtitle1FontSize));
--subtitle2LetterSpacing: calc(.0175 * var(--subtitle2FontSize));
--captionLetterSpacing: calc(.015 * var(--captionFontSize));
--caption-boldLetterSpacing: calc(.015 * var(--captionFontSize));
--overlineLetterSpacing: calc(.012 * var(--overlineFontSize));
--overline-largeLetterSpacing: calc(.0175 * var(--overline-largeFontSize));
--label-1LetterSpacing: calc(.0175 * var(--label-1FontSize));
--label-1-allCapsLetterSpacing: calc(.0175 * var(--label-1-allCapsFontSize));
--label-2LetterSpacing: calc(.015 * var(--label-2FontSize));
—label-2-allCapsLetterSpacing: calc(.015 * var(--label-2-allCapsFontSize));
--label-smallLetterSpacing: calc(.012 * var(--label-smallFontSize));
--CTALetterSpacing: calc(.012 * var(--CTAFontSize));
--CTA-SmallLetterSpacing: calc(.0175 * var(--CTA-SmallFontSize));
--smallLetterSpacing: calc(.013 * var(--smallFontSize));
--small-semiboldLetterSpacing: calc(.013 * var(--smallFontSize));
--statLetterSpacing: calc(.013 * var(--statFontSize));

[evangk6]

PR is ready for review:
finos/a11y-theme-builder-sdk#153