lib: adds colors to X's and .'s in test_runner dot reporter

Author: aidanchadha-max

lib/internal/test_runner/reporter/dot.js

@@ -7,10 +7,10 @@ module.exports = async function* dot(source) {
   let columns = getLineLength();
   for await (const { type } of source) {
     if (type === 'test:pass') {
-      yield '${green}.${clear}';
+      yield `${green}.${clear}`;
     }
     if (type === 'test:fail') {
-      yield '${red}X${clear}';
+      yield `${red}X${clear}`;
     }
     if ((type === 'test:fail' || type === 'test:pass') && ++count === columns) {
       yield '\n';