Fix encryptionEnabled check

lib/components/matrix.dart

@@ -97,11 +97,6 @@ class MatrixState extends State<Matrix> {
 
   hideLoadingDialog() => Navigator.of(_loadingDialogContext)?.pop();
 
-  bool get encryptionEnabled =>
-      client.userDeviceKeys.containsKey(client.userID) &&
-      client.userDeviceKeys[client.userID].deviceKeys
-          .containsKey(client.deviceID);
-
   Future<String> downloadAndSaveContent(MxContent content,
       {int width, int height, ThumbnailMethod method}) async {
     final bool thumbnail = width == null && height == null ? false : true;

lib/views/chat_encryption_settings.dart

@@ -64,7 +64,7 @@ class _ChatEncryptionSettingsState extends State<ChatEncryptionSettings> {
                 color: room.encrypted ? Colors.green : Colors.red),
             onTap: () {
               if (room.encrypted) return;
-              if (!Matrix.of(context).encryptionEnabled) {
+              if (!room.client.encryptionEnabled) {
                 Toast.show(I18n.of(context).needPantalaimonWarning, context,
                     duration: 8);
                 return;
@@ -84,7 +84,7 @@ class _ChatEncryptionSettingsState extends State<ChatEncryptionSettings> {
           ListTile(
             trailing: Icon(Icons.info),
             subtitle: Text(
-              Matrix.of(context).encryptionEnabled
+              room.client.encryptionEnabled
                   ? I18n.of(context).warningEncryptionInBeta
                   : I18n.of(context).needPantalaimonWarning,
             ),