attempt to resolve default prettier path in normalize

Author: SimenB

packages/jest-config/src/normalize.ts

@@ -648,6 +648,10 @@ export default async function normalize(
     options.coverageDirectory = path.resolve(options.rootDir, 'coverage');
   }
 
+  if (!options.prettierPath) {
+    options.prettierPath = DEFAULT_CONFIG.prettierPath;
+  }
+
   setupBabelJest(options);
   // TODO: Type this properly
   const newOptions = {