feat: calculate number of days for email reminder

src/Service/Cron/DispositionReminderService.php

@@ -55,10 +55,11 @@ class DispositionReminderService
 
             $this->mailer->createAndSendEmail([
                 'disposition' => $disposition,
+                'diffInDays' => 5,
             ], [
                 'to' => $teamer->getCommunication()->getEmail(),
                 'subject' => 'Reminder: Dein Einsatz '.$destination,
-                'template' => 'email/reminder_pre_disposition.html.twig',
+                'template' => 'email/reminder_disposition.html.twig',
             ]);
         }