Fix video sensing by calling updateMatrix manually before using isTouching

src/extensions/scratch3_video_sensing/library.js

@@ -289,6 +289,11 @@ class VideoMotion {
                 _curr: curr
             } = this;
 
+            // The public APIs for Renderer#isTouching manage keeping the matrix and
+            // silhouette up-to-date, which is needed for drawable#isTouching to work
+            drawable.updateMatrix();
+            if (drawable.skin) drawable.skin.updateSilhouette();
+
             // Restrict the region the amount and direction are built from to
             // the area of the current frame overlapped by the given drawable's
             // bounding box.