Fix redundant array check in purchase event

[Codencode]

Questions	Answers
Description?	This PR removes a redundant is_array() check in GoogleAnalyticsTools::renderPurchaseEvent(). $orderProducts is already declared as an array in the method PHPDoc, so PHPStan correctly reports: Call to function is_array() with array will always evaluate to true. The issue is reproducible directly on the current dev branch and is unrelated to any functional change.
Type?	bug fix
BC breaks?	no
Deprecations?	no
Fixed ticket?	F
Related to	#170 (comment)
Sponsor company	Codencode snc
How to test?	Run the PHPStan checks and verify that the develop job passes without reporting: Call to function is_array() with array will always evaluate to true.

[ps-jarvis]

Hello @Codencode!

This is your first pull request on ps_googleanalytics repository of the PrestaShop project.

Thank you, and welcome to this Open Source community!

[Hlavtox]

It would be best to add types to the methods. Since the minimum php version is now 7.2, we can. :-)

[Codencode]

@Hlavtox good point, thanks!

I’ve updated GoogleAnalyticsTools to use native parameter and return types across the class.