test: normalize fixtures use

This commit replaces the use of `common.fixturesDir`
with `common.fixtures` & `fixtures.path` in
`test-fs-read-stream-resume.js`

PR-URL: #15855
Reviewed-By: Richard Lau <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Gireesh Punathil <[email protected]>

Author: ruxandrafed

test/parallel/test-fs-read-stream-resume.js

@@ -20,13 +20,13 @@
 // USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 'use strict';
-const common = require('../common');
+require('../common');
+const fixtures = require('../common/fixtures');
 const assert = require('assert');
 
 const fs = require('fs');
-const path = require('path');
 
-const file = path.join(common.fixturesDir, 'x.txt');
+const file = fixtures.path('x.txt');
 let data = '';
 let first = true;