Merge pull request #524 from GovTechSG/fix/accordion-active-color-sass-vairable

fix(accordion): accordion-button-active-color should be set to  inste…

Author: clukhei

lib/sgds/sass/_variables.scss

@@ -1425,7 +1425,7 @@ $accordion-button-bg: $accordion-bg !default;
 $accordion-transition: $btn-transition,
 border-radius .15s ease !default;
 $accordion-button-active-bg: none !default;
-$accordion-button-active-color: $purple-500 !default;
+$accordion-button-active-color: $primary !default;
 
 $accordion-button-focus-border-color: $input-focus-border-color !default;
 $accordion-button-focus-box-shadow: $btn-focus-box-shadow !default;