fixup! util: respect nested formats in styleText

Author: himself65

test/parallel/test-util-styletext.js

@@ -60,6 +60,17 @@ assert.strictEqual(
   '\x1B[31mA\x1B[41m\x1B[34mB\x1B[31m\x1B[49mC\x1B[39m'
 );
 
+assert.strictEqual(
+  util.styleText('blue',
+                 'blue' +
+    util.styleText('red',
+                   'red' +
+      util.styleText('green', 'green', { validateStream: false }) +
+      'red', { validateStream: false }) +
+    'blue', { validateStream: false }),
+  '\x1B[34mblue\x1B[31mred\x1B[32mgreen\x1B[31mred\x1B[34mblue\x1B[39m'
+);
+
 assert.strictEqual(
   util.styleText(['bold', 'red'], 'test', { validateStream: false }),
   util.styleText(