fix(activity): ensure absolute URL are used

Signed-off-by: skjnldsv <skjnldsv@protonmail.com>

lib/Activity/ProviderParser.php

@@ -286,7 +286,7 @@ protected function generateCircleParameter(Circle $circle): array {
 			'id' => $circle->getSingleId(),
 			'name' => $circle->getName(),
 			'_parsed' => $circle->getName(),
-			'link' => $circle->getUrl()
+			'link' => $this->url->getAbsoluteURL($circle->getUrl()),
 		];
 	}