Fix template code

Author: HT43-bqxFqB

templates/mysqlbackup.sh.erb

@@ -84,7 +84,7 @@ cleanup
 <% if @excludedatabases.empty? -%>
 mysql --defaults-extra-file=$TMPFILE -s -r -N -e 'SHOW DATABASES' | while read dbname
 <% else -%>
-mysql --defaults-extra-file=$TMPFILE -s -r -N -e 'SHOW DATABASES' | grep -v '^\(<% @excludedatabases.join('|') %>\)$' | while read dbname
+mysql --defaults-extra-file=$TMPFILE -s -r -N -e 'SHOW DATABASES' | grep -v '^\(<%= @excludedatabases.join('|') %>\)$' | while read dbname
 <% end -%>
 do
   <%= @backupmethod -%> --defaults-extra-file=$TMPFILE --opt --flush-logs --single-transaction \