Fix trusted-scoring-signals.https.window.js test variant.

It was running tests 41-45, 45-50 and then 50-52, which means tests
45 and 50 were in two different variants, so each was run twice.

Bug: None
Change-Id: I4d9b628fe369fdb438253c3b4a925a463647eb72
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5954791
Reviewed-by: Maks Orlovich <morlovich@chromium.org>
Commit-Queue: mmenke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1372773}

fledge/tentative/trusted-scoring-signals.https.window.js

@@ -13,8 +13,8 @@
 // META: variant=?31-35
 // META: variant=?36-40
 // META: variant=?41-45
-// META: variant=?45-50
-// META: variant=?50-last
+// META: variant=?46-50
+// META: variant=?51-last
 
 "use strict";