test: http2-respond-file-range to use fixtures

Changed test-http2-respond-file-range to use fixtures.path directly
instead of passing through the common module.

PR-URL: https://github.com/nodejs/node/pull/15852
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ryan Graham <r.m.graham@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

test/parallel/test-http2-respond-file-range.js

@@ -3,9 +3,9 @@
 const common = require('../common');
 if (!common.hasCrypto)
   common.skip('missing crypto');
+const fixtures = require('../common/fixtures');
 const http2 = require('http2');
 const assert = require('assert');
-const path = require('path');
 const fs = require('fs');
 
 const {
@@ -14,7 +14,7 @@ const {
   HTTP2_HEADER_LAST_MODIFIED
 } = http2.constants;
 
-const fname = path.resolve(common.fixturesDir, 'printA.js');
+const fname = fixtures.path('printA.js');
 const data = fs.readFileSync(fname);
 const stat = fs.statSync(fname);