Fix javascript return error

Author: HaoK

src/Components/test/E2ETestMigration/Tests/InputFileTest.cs

@@ -166,7 +166,7 @@ public async Task CanUploadAndConvertImageFile()
                 canvas.height = image.naturalHeight;
                 context.drawImage(image, 0, 0, image.naturalWidth, image.naturalHeight);
 
-                return canvas.toDataURL().split(',').pop();");
+                canvas.toDataURL().split(',').pop();");
 
             // Save the image file locally
             var file = TempFile.Create(_tempDirectory, "png", Convert.FromBase64String(base64));