fix(test): Add missing parameter for ActivityManager constructor

Signed-off-by: Louis Chemineau <louis@chmn.me>
Signed-off-by: Milen Pivchev <milen.pivchev@gmail.com>

tests/Controller/APIv1ControllerTest.php

@@ -208,7 +208,8 @@ public function testGet(string $user, int $start, int $count, array $expected):
 			$this->createMock(IUserSession::class),
 			$config,
 			\OC::$server->query(IValidator::class),
-			$this->createMock(IL10N::class)
+			\OC::$server->query(\OCP\RichObjectStrings\IRichTextFormatter::class),
+			$this->createMock(IL10N::class),
 		);
 		$activityManager->registerProvider(Provider::class);
 		$activityManager->registerSetting(Setting1::class);