relax remind at change check to simple presence check

In case of wonky time comparison issues, we'd rather have the reminder rescheduled with minimal
tolerance than not having the reminder set at all

app/services/reminders/update_service.rb

@@ -31,7 +31,7 @@ class UpdateService < ::BaseServices::Update
     def after_perform(service_call)
       reminder = service_call.result
 
-      if remind_at_changed?(reminder)
+      if remind_at_changed?
         destroy_scheduled_reminder_job(reminder.job_id) if reminder.scheduled?
         mark_unread_notifications_as_read_for(reminder) if reminder.unread_notifications?
 
@@ -44,10 +44,10 @@ def after_perform(service_call)
 
     private
 
-    def remind_at_changed?(reminder)
+    def remind_at_changed?
       # For some reason reminder.remind_at_changed? returns false
       # so we assume a change if remind_at is present in the params (would have passed contract validation)
-      params.key?(:remind_at) && reminder.remind_at.to_i == params[:remind_at].to_i
+      params[:remind_at].present?
     end
 
     def destroy_scheduled_reminder_job(job_id)