Fix the check to see if the financialAclExtension is installed

[johntwyman]

Overview

This PR fixes a small mistake in the incremental upgrader.

Before

The reference to the key/value pair that determines if an extension is installed is incorrect: $financialAclExtension['status'].

After

The reference is fixed: $financialAclExtension['values'][0]['status'].

Comments

I don't know how to test this to be honest but I have used the API3 Explorer to confirm the data model for results return from civicrm_api3('extension', 'get', ...) calls is such that the status key definitely sits within the array underneath the values key. It is not at the same level of the object as the count key.

[civibot]

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