fix(web-app-matrix): turn off Element's forced verification in variant 1

4a56b4c19c set services.element.force_verification to false only for
the SSO variants 0 and 2, on the reasoning that only the SSO specs log
the same account in twice. The deploy's second pass logs the variant 1
administrator (ansible flavor, SSO off, password login) in again. PASS 1
bootstraps the account's cross-signing identity, so in PASS 2 Element
stops on "Confirm your digital identity" ("Use another device" / "Can't
confirm?" / "Remove this device", no skip), and the password-login spec
times out at _shared.js:436 (fork run 40979252521, job 123823820263,
Discourse#1 with web-app-matrix variant 1, all three retries).

Variant 1 now sets force_verification to false like the other two. The
services.yml default stays true, so production keeps forced
verification. No variant exercises true end to end any more; the
follow-up issue restores one.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

roles/web-app-matrix/meta/variants.yml

@@ -50,6 +50,8 @@
     container_backup:
       enabled: false
       shared: false # nocheck: variants-static-override backup shared stays literally true
+    element:
+      force_verification: false
     matrix:
       flavor: ansible
     coturn: