test: fix spawnsync-shell to check correct options on Windows

This test expected to use cmd.exe options even if
the shell was powershell. This commit fixes to check correct options
for shells other than cmd.exe.

lib/child_process.js

@@ -450,7 +450,7 @@ function normalizeSpawnArguments(file, args, options) {
 
   // Validate windowsHide, if present.
   if (options.windowsHide != null &&
-    typeof options.windowsHide !== 'boolean') {
+      typeof options.windowsHide !== 'boolean') {
     throw new ERR_INVALID_ARG_TYPE('options.windowsHide',
                                    'boolean', options.windowsHide);
   }

test/parallel/test-child-process-spawnsync-shell.js

@@ -54,11 +54,13 @@ assert.strictEqual(env.stdout.toString().trim(), 'buzz');
 
   function test(testPlatform, shell, shellOutput) {
     platform = testPlatform;
-
+    const isCmd = shellOutput.endsWith('cmd.exe') ||
+                   shellOutput.endsWith('cmd');
     const cmd = 'not_a_real_command';
-    const shellFlags = platform === 'win32' ? ['/d', '/s', '/c'] : ['-c'];
-    const outputCmd = platform === 'win32' ? `"${cmd}"` : cmd;
-    const windowsVerbatim = platform === 'win32' ? true : undefined;
+
+    const shellFlags = isCmd ? ['/d', '/s', '/c'] : ['-c'];
+    const outputCmd = isCmd ? `"${cmd}"` : cmd;
+    const windowsVerbatim = isCmd ? true : undefined;
     internalCp.spawnSync = common.mustCall(function(opts) {
       assert.strictEqual(opts.file, shellOutput);
       assert.deepStrictEqual(opts.args,