test: refresh the tmpdir before using

Test fails if tmp dir does not exist when the test is run. Add
common.refreshTmpDir() so that doesn't happen.

PR-URL: #7327
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Johan Bergström <[email protected]>
Reviewed-By: Santiago Gimeno <[email protected]>
Reviewed-By: Brian White <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>

Author: Trott

test/parallel/test-fs-watch-encoding.js

@@ -10,6 +10,8 @@ if (common.isFreeBSD) {
   return;
 }
 
+common.refreshTmpDir();
+
 const fn = '新建文夹件.txt';
 const a = path.join(common.tmpDir, fn);