Remove temporary renewal file if it exists

src/freedombone-utils-web

     # the main script tries to renew once per month
     { echo '#!/bin/bash';
       echo '';
+      echo 'if [ -f ~/temp_renewletsencrypt.txt ]; then';
+      echo '    rm ~/temp_renewletsencrypt.txt';
+      echo 'fi';
+      echo '';
       echo 'if [ -f /tmp/.upgrading ]; then';
       echo '    if [ ! -f ~/letsencrypt_failed ]; then';
       echo '        touch ~/letsencrypt_failed';
     # a secondary script keeps trying to renew after a failure
     { echo '#!/bin/bash';
       echo '';
+      echo 'if [ -f ~/temp_renewletsencrypt.txt ]; then';
+      echo '    rm ~/temp_renewletsencrypt.txt';
+      echo 'fi';
+      echo '';
       echo 'if [ -f /tmp/.upgrading ]; then';
       echo '    if [ ! -f ~/letsencrypt_failed ]; then';
       echo '        touch ~/letsencrypt_failed';