Prevent erroneous dropping of customPropertiesWhitelist array on ValidVariableName sniff

[westonruter]

My PHPCS ruleset included:

<rule ref="WordPress.NamingConventions.ValidVariableName">
	<properties>
		<property name="customPropertiesWhitelist" type="array" value="textContent,nodeName,nodeValue" />
	</properties>
</rule>

Nevertheless, I was still getting flagged for code like:

'label' => $link->textContent,

I found that the conditions surrounding the retrieval of the customPropertiesWhitelist property were inadvertently dropping the value when it was defined properly as an array.

[grappler]

@westonruter I think #841 will fix your issue once it is merged.

[jrfnl]

Marking this as a duplicate of #839 and partial duplicate to the more comprehensive #841.
@westonruter Could you please test with #841 ? That PR should fix these kind of issues for all sniffs merging custom lists.

[westonruter]

👍 #841 fixes it.