Issue #3500483: add cache contexts in applies().

Brooke Mahoneyrequested to merge
issue/easy_breadcrumb-3500483:3500483-32 into 2.x

Expands cache context from url.path to url. See https://www.drupal.org/project/easy_breadcrumb/issues/3500483#comment-16710931

Closes #3500483

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