Update backup creation paths for SSSS

This updates the various backup creation entry points to ensure they support
creating with secret storage if the feature flag is enabled.

src/async-components/views/dialogs/keybackup/RecoveryMethodRemovedDialog.js

@@ -1,5 +1,6 @@
 /*
 Copyright 2019 New Vector Ltd
+Copyright 2020 The Matrix.org Foundation C.I.C.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -35,6 +36,7 @@ export default class RecoveryMethodRemovedDialog extends React.PureComponent {
         this.props.onFinished();
         Modal.createTrackedDialogAsync("Key Backup", "Key Backup",
             import("./CreateKeyBackupDialog"),
+            null, null, /* priority = */ false, /* static = */ true,
         );
     }