ProductVariation->toUrl() overrides passed $options

Problem/Motivation

Let's suppose you wish to to get absolute URL to a product variation, according to documentation, you should be able to do this:
$dataProduct->toUrl('canonical', ['absolute' => TRUE])->toString();
But it won't work because ProductVariation::toUrl() method overrides the $options passed in parameter.
Little a 1 character patch is necessary. I will attach it !

Proposed resolution

Merge passed $options and default built options in the toUrl().

Remaining tasks

- patch
- review

User interface changes

- none

API changes

- none, since it should work as per documentation.

Data model changes

- none