Update QUIC field trial config

As requested by Finch tool on Finch config CLs.

Change-Id: I9717078a7a8ecc3bd49af49204637ce983f56c7e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441317
Auto-Submit: David Schinazi <dschinazi@chromium.org>
Commit-Queue: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812543}

testing/variations/fieldtrial_testing_config.json

@@ -5591,9 +5591,8 @@
                 {
                     "name": "Enabled",
                     "params": {
-                        "connection_options": "5RTO",
                         "enable_quic": "true",
-                        "quic_version": "h3-Q050",
+                        "quic_version": "h3-29,h3-Q050",
                         "retransmittable_on_wire_timeout_milliseconds": "200"
                     },
                     "enable_features": [