Forcing string comparison to ensure check works

node['apache']['listen_ports'] is an array of strings, so my earlier fix wasn't working properly. This does the trick:

```
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 Chef Version: 11.8.2
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run `help' for help, `exit' or ^D to quit.

Ohai2u user@host.domain.tld!
chef > node['apache']['listen_ports']
 => ["80"] 
chef > node['kibana']['apache']['port']
 => 80 
chef > node['apache']['listen_ports'].include?(node['kibana']['apache']['port'])
 => false 
chef > node['apache']['listen_ports'].include?(node['kibana']['apache']['port'].to_s)
 => true 
chef > 
```