Fix type

Author: HT43-bqxFqB

manifests/server/backup.pp

@@ -112,7 +112,7 @@
   $compression_command      = undef,
   $compression_extension    = undef,
   $backupmethod_package     = $mysql::params::xtrabackup_package_name,
-  Array[Strings] $excludedatabases = [],
+  Array[String] $excludedatabases = [],
 ) inherits mysql::params {
   if $prescript and $provider =~ /(mysqldump|mysqlbackup)/ {
     warning("The 'prescript' option is not currently implemented for the ${provider} backup provider.")