Keep entered proxy line at the end of the file

src/freedombone-base-email

@@ -1079,10 +1079,8 @@ function email_smtp_proxy_through_isp {
           echo '#';
           echo '# see exim4_passwd_client(5) for more documentation';
           echo '#';
+          echo "${isp_smtp_domain_alias_line}";
           echo "${isp_smtp_domain}:${isp_smtp_username}:${isp_smtp_password}"; } > /etc/exim4/passwd.client
-        if [ "${isp_smtp_domain_alias_line}" ]; then
-            echo "${isp_smtp_domain_alias_line}" >> /etc/exim4/passwd.client
-        fi
         if ! grep -q 'dc_eximconfig_configtype=' /etc/exim4/update-exim4.conf.conf; then
             echo "dc_eximconfig_configtype='smarthost'" >> /etc/exim4/update-exim4.conf.conf
         else