Gardening: update path to capture_screenshot.ps1 script

tools/testing/dart/browser_controller.dart

Index: tools/testing/dart/browser_controller.dart
diff --git a/tools/testing/dart/browser_controller.dart b/tools/testing/dart/browser_controller.dart
index 489efc51ef4130bbd1e9c0e13a6acdb214a48ef1..9d7ec28477e6b76582f40ffded83c273a0525921 100644
--- a/tools/testing/dart/browser_controller.dart
+++ b/tools/testing/dart/browser_controller.dart
@@ -1903,9 +1903,9 @@ Future captureInternetExplorerScreenshot(String message) async {
 
   // The "capture_screen.ps1" script is next to "test.dart" in "tools/"
   final powerShellScript =
-      Platform.script.resolve('capture_screenshot.ps1').toFilePath();
+      Platform.script.resolve('../../capture_screenshot.ps1').toFilePath();
   final screenshotFile =
-      Platform.script.resolve('../$screenshotName').toFilePath();
+      Platform.script.resolve('../../../$screenshotName').toFilePath();
 
   final args = [
     '-ExecutionPolicy',