docs(ops): point the demo-mode notes at the right issue (#190)

The tracking issue was filed as #190; the compose banner and the guard test both said #191, guessing the number before it existed. A note that points at the wrong issue is worse than no note when the thing it tracks is production not taking money.

backend/tests/unit/composeEnvironment.test.ts

@@ -56,7 +56,7 @@ const DEPLOYMENTS = [
   },
   {
     file: 'docker-compose.prod.yml',
-    // TEMPORARY, and #191 restores it to 'false'. Production is in demo mode
+    // TEMPORARY, and #190 restores it to 'false'. Production is in demo mode
     // since 2026-08-25 — the stack was brought up during the cutover to this
     // file before the live PayPal credentials were available, and demo mode is
     // the sanctioned interim for that. This assertion is what keeps the state

docker-compose.prod.yml

@@ -112,7 +112,7 @@ services:
       # on 2026-08-25 to bring the stack up during the cutover to this file
       # before the live PayPal credentials were to hand.
       #
-      # Restoring it is #191. Set this back to `false`, fill the three stack
+      # Restoring it is #190. Set this back to `false`, fill the three stack
       # variables below, and redeploy. Until then every order placed is a
       # pretend one.
       # ===================================================================