chore: small fix for platform config usage

Author: jorenbroekema

src/register.ts

@@ -73,7 +73,7 @@ export async function register(sd: typeof StyleDictionary, transformOpts?: Trans
     type: 'value',
     transitive: true,
     filter: token => ['string', 'object'].includes(typeof (token.$value ?? token.value)),
-    transform: (token, config) => checkAndEvaluateMath(token, config.options?.mathFractionDigits),
+    transform: (token, platformCfg) => checkAndEvaluateMath(token, platformCfg.mathFractionDigits),
   });
 
   sd.registerTransform({

test/spec/checkAndEvaluateMath.spec.ts

@@ -127,9 +127,7 @@ describe('check and evaluate math', () => {
       platforms: {
         css: {
           transformGroup: 'tokens-studio',
-          options: {
-            mathFractionDigits: 3,
-          },
+          mathFractionDigits: 3,
           files: [
             {
               format: 'css/variables',