Update domain_counts_accountcodes.php

[n0obHere]

Without the quotes it was interpreting domain_name as a constant instead of treating it as a string key for the array

[markjcrane]

Sorry, I didn't notice the pull request sooner.

Please sign up as a contributor and your pulled requests will be accepted.
https://github.com/fusionpbx/open-source

[n0obHere]

@markjcrane, Hello Mark, I've already submitted the sign up CLA here.

fusionpbx/open-source#297

Thanks