Rename AuthUser#neopass? -> AuthUser#uses_neopass?

This is more consistent with the `uses_omniauth?` we already have, and
it also will help for the next change, where I want a `uses_password?`
method (and using the name `password?` breaks some of Devise's
validation code).

app/models/auth_user.rb

@@ -40,7 +40,7 @@ class AuthUser < AuthRecord
     super && !uses_omniauth?
   end
 
-  def neopass?
+  def uses_neopass?
     provider == "neopass"
   end
 
@@ -50,7 +50,7 @@ class AuthUser < AuthRecord
 
   def disconnect_neopass
     # If there's no NeoPass, we're already done!
-    return true if !neopass?
+    return true if !uses_neopass?
 
     begin
       # Remove all of the NeoPass fields, and return whether we were

app/models/user.rb

@@ -4,7 +4,7 @@ class User < ApplicationRecord
   PreviewTopContributorsCount = 3
 
   belongs_to :auth_user, foreign_key: :remote_id, inverse_of: :user
-  delegate :neopass?, :disconnect_neopass, to: :auth_user
+  delegate :disconnect_neopass, to: :auth_user
 
   has_many :closet_hangers
   has_many :closet_lists

app/views/devise/registrations/edit.html.erb

@@ -52,7 +52,7 @@
   </div>
 <% end %>
 
-<% if resource.neopass? %>
+<% if resource.uses_neopass? %>
   <%= form_with url: user_neopass_connection_path(resource.user), method: :delete,
       class: "settings-form", data: {
         turbo_confirm: "Are you sure? Without a NeoPass, you'll need to use " +