Video Tutorials : Updated field trial testing config

Bug: None
Change-Id: I16f6444538130e4d7a550dec7b82621608d46b8a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2613889
Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
Reviewed-by: Caitlin Fischer <caitlinfischer@google.com>
Cr-Commit-Position: refs/heads/master@{#841353}

testing/variations/fieldtrial_testing_config.json

@@ -8111,8 +8111,7 @@
                         "default_locale": "en",
                         "experiment_tag": "",
                         "fetch_frequency": "15",
-                        "summary_card_poster_url": "https://www.google.com/images/branding/googlelogo/1x/googlelogo_color_272x92dp.png",
-                        "use_animated_gif_url": "false"
+                        "use_animated_gif_url": "true"
                     },
                     "enable_features": [
                         "VideoTutorials"