Favour network over homeserver reachability when computing the offline indicator. (#4805)

For a whole host of reasons we don't support air-gapped operation anyway and as the SDK is super slow to tell us about the homeserver's reachability the indicator wasn't really working.

ElementX/Sources/Application/AppCoordinator.swift

@@ -1077,7 +1077,8 @@ class AppCoordinator: AppCoordinatorProtocol, AuthenticationFlowCoordinatorDeleg
                 
                 switch state {
                 case .loading:
-                    if self?.userSession?.clientProxy.homeserverReachabilityPublisher.value == .reachable {
+                    if self?.userSession?.clientProxy.homeserverReachabilityPublisher.value == .reachable,
+                       self?.appMediator.networkMonitor.reachabilityPublisher.value == .reachable {
                         ServiceLocator.shared.userIndicatorController.submitIndicator(.init(id: toastIdentifier, type: .toast(progress: .indeterminate), title: L10n.commonSyncing, persistent: true))
                     }
                 case .notLoading: