Inline UserUpdate#call into Users::NamesController

Only including the few bits we need.

We were hardly using any of the logic in `UserUpdate#call` and so I
think it's simpler and more idiomatic to include the logic directly in
the controller action.

In general I think there are better ways to avoid the kind of
duplication that `UserUpdate` was intended to avoid.

app/controllers/users/names_controller.rb

@@ -8,8 +8,8 @@ class Users::NamesController < ApplicationController
   def edit; end
 
   def update
-    updater = UserUpdate.new(@user, user_params, current_user, user_ip_address)
-    if updater.call
+    if @user.update(user_params)
+      EventLog.record_event(@user, EventLog::ACCOUNT_UPDATED, initiator: current_user, ip_address: user_ip_address)
       redirect_to user_path(@user), notice: "Updated user #{@user.email} successfully"
     else
       render :edit