Current page title doing unnecessary URL encoding

Problem/Motivation

CurrentPageTitle is relying on urlencode to do HTML escaping. But urlencode does other things we don't want here, like turning non-ASCII characters into percent-encoded values.

Proposed resolution

According to Drupal\Core\Controller\TitleResolverInterface, where we're getting the title from, title can be either:

• a render array like ['#markup' => 'title', '#allowed_tags' => ['em']]
• a string

So if $value is an array, we should call render($value). If it's a string, we can let twig auto-escape it (as now).