Update default from address to a mailbox that actually works (it forw…

…ards to mattz@codeforboston.org currently).

Co-authored-by: mcarre20 <mcarre20@users.noreply.github.com>
Co-authored-by: Anna Westland-Tegart <aTegart@users.noreply.github.com>
Co-authored-by: Andrew <andrewydev6@gmail.com>
Co-authored-by: Mike Lynch <mikelynch@users.noreply.github.com>
Co-authored-by: Laura Filmeyer <lfilmeyer@users.noreply.github.com>

backend/app/mailers/application_mailer.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
 class ApplicationMailer < ActionMailer::Base
-  default from: 'from@example.com'
+  default from: 'help@bostonhpa.org'
   layout 'mailer'
 end