Update cloudflare.com Expect-CT URL in preload list entry

The URL changed a while ago but the preload list entry was never updated.

R=nharper@chromium.org, palmer@chromium.org

Change-Id: I0cb0f9aad351f92585cb40cd8b1873881a10414c
Reviewed-on: https://chromium-review.googlesource.com/c/1341524Reviewed-by: Nick Harper <nharper@chromium.org>
Commit-Queue: Nick Harper <nharper@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609425}

net/http/transport_security_state_static.json

@@ -61087,7 +61087,7 @@
       "policy": "custom",
       "mode": "force-https", "include_subdomains": true,
       "expect_ct": true,
-      "expect_ct_report_uri": "https://report-uri.cloudflare.com/expect-ct"
+      "expect_ct_report_uri": "https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
     },
     {
       "name": "weeblrpress.com",