fixed saving screenshot file

Author: DavertMik

lib/mocha/test.js

@@ -135,7 +135,8 @@ function cloneTest(test) {
 
 function testToFileName(test) {
   let fileName = clearString(test.title)
-  fileName = fileName.replace(/\@\w+/g, '')
+  // remove tags with empty string (disable for now)
+  // fileName = fileName.replace(/\@\w+/g, '')
   fileName = fileName.slice(0, 100)
   if (fileName.indexOf('{') !== -1) {
     fileName = fileName.substr(0, fileName.indexOf('{') - 3).trim()