Bug 1575762 [wpt PR 18606] - Update interfaces/shape-detection-api.idl, a=testonly

Automatic update from web-platform-tests
Update interfaces/shape-detection-api.idl (#18606)

Source: https://github.com/tidoust/reffy-reports/blob/d705188/whatwg/idl/shape-detection-api.idl
Build: https://travis-ci.org/tidoust/reffy-reports/builds/575189906
--

wpt-commits: 2ac3724aeddf43352e94f08b512ac93d6f35eebc
wpt-pr: 18606

testing/web-platform/tests/interfaces/shape-detection-api.idl

@@ -5,7 +5,7 @@
 
 [Exposed=(Window,Worker),
  SecureContext,
- Constructor(optional FaceDetectorOptions faceDetectorOptions)]
+ Constructor(optional FaceDetectorOptions faceDetectorOptions = {})]
 interface FaceDetector {
   Promise<sequence<DetectedFace>> detect(ImageBitmapSource image);
 };
@@ -36,7 +36,7 @@ enum LandmarkType {
 
 [Exposed=(Window,Worker),
  SecureContext,
- Constructor(optional BarcodeDetectorOptions barcodeDetectorOptions)]
+ Constructor(optional BarcodeDetectorOptions barcodeDetectorOptions = {})]
 interface BarcodeDetector {
   static Promise<sequence<BarcodeFormat>> getSupportedFormats();