Posthog: flush queue before optin out.

vector/src/main/java/im/vector/app/features/analytics/impl/DefaultVectorAnalytics.kt

@@ -156,6 +156,8 @@ class DefaultVectorAnalytics @Inject constructor(
                     pendingUserProperties = null
                 }
                 false -> {
+                    // When opting out, ensure that the queue is flushed first, or it will be flushed later (after user has revoked consent)
+                    posthog?.flush()
                     posthog?.optOut(true)
                 }
             }