Remove backup email templates on upgrade

src/freedombone-upgrade

@@ -95,6 +95,7 @@ if [ -d "$PROJECT_DIR" ]; then
         apt-get -yq -t stretch-backports install certbot
         email_install_tls
         email_disable_chunking
+        rm /etc/exim4/exim4.conf.template.bak*
         #defrag_filesystem
 
         # reinstall tor from backports