tools: undefined name opts -> args in gyptest.py

```
./tools/gyp/gyptest.py:61:47: F821 undefined name 'opts'
    extra_path = [os.path.abspath(p) for p in opts.path]
                                              ^
```
`opts.path` is an undefined name in this context while `args.path` is
used on the preceding line and is defined on line 48.  Undefined names
have the potential to raise `NameError` at runtime which will halt the
script.

PR-URL: #30144
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>

tools/gyp/gyptest.py

@@ -58,7 +58,7 @@ def main(argv=None):
     os.chdir(args.chdir)
 
   if args.path:
-    extra_path = [os.path.abspath(p) for p in opts.path]
+    extra_path = [os.path.abspath(p) for p in args.path]
     extra_path = os.pathsep.join(extra_path)
     os.environ['PATH'] = extra_path + os.pathsep + os.environ['PATH']