Fix reports settings

[Zenidd]

Hi team,

This PR fixes the wrong concat target for reports.pp.
This PR adds multiple email targets capability.

Greetings,

JP

[Zenidd]

Example configuration snippet

  wazuh::reports { 'report_0':
    r_title  => 'Test report',
    r_email_to => ['example@domain.com','example2@domain.com'],
    r_showlogs    => 'yes',
  }

Related ossec.conf rendered configuration:

<reports>
  <title>Test report</title>
   <email_to>example@domain.com</email_to>
   <email_to>example2@domain.com</email_to>
  <showlogs>yes</showlogs>
</reports>