UI: secure text field for password

Change-Id: I5b61f1ef0d7211e6d3f1fd12efd5af0447207272
diff --git a/Ring/Ring/Features/Me/Me/MeViewController.swift b/Ring/Ring/Features/Me/Me/MeViewController.swift
index 339ff3e..787e473 100644
--- a/Ring/Ring/Features/Me/Me/MeViewController.swift
+++ b/Ring/Ring/Features/Me/Me/MeViewController.swift
@@ -453,6 +453,7 @@
         if self.viewModel.havePassord {
             alert.addTextField {(textField) in
                 textField.placeholder = L10n.AccountPage.revokeDevicePlaceholder
+                textField.isSecureTextEntry = true
             }
             if let textFields = alert.textFields {
                 textFields[0].rx.text.map({text in