[gardening] Fix standalone/io/regress_50904_test

* Do not use runInShell on Android.
* Forward runtime flags to the child process.

Fixes https://github.com/dart-lang/sdk/issues/52657

Fixed: 52657
Cq-Include-Trybots: luci.dart.try:vm-aot-android-release-arm64c-try
Change-Id: Ie2761172f80cb3fc3f22a89984e417ca8c38d4f1
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/308342
Commit-Queue: Tess Strickland <sstrickl@google.com>
Reviewed-by: Tess Strickland <sstrickl@google.com>

tests/standalone/io/regress_50904_test.dart

@@ -19,8 +19,11 @@ Future<void> runTest(int length) async {
 
   final Process proc = await Process.start(
     Platform.executable,
-    <String>[Platform.script.toFilePath(), 'receiver'],
-    runInShell: true,
+    <String>[
+      ...Platform.executableArguments,
+      Platform.script.toFilePath(),
+      'receiver',
+    ],
   );
 
   proc.stdin.add(bytes);