test: fix single test runner regression

When ESM support was added it created a regression in the test runner
that broke the ability to run individual tests. This commit
re-introduces the use of `NormalizePath` which fixes the regression
in the test runner

Refs: #15300
PR-URL: #15329
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

tools/test.py

@@ -789,7 +789,7 @@ def Contains(self, path, file):
     if len(path) > len(file):
       return False
     for i in xrange(len(path)):
-      if not path[i].match(file[i]):
+      if not path[i].match(NormalizePath(file[i])):
         return False
     return True