fix: Disable imagick preview providers

Signed-off-by: Joas Schilling <coding@schilljs.com>

Author: nickvergessen

lib/private/Preview/IMagickSupport.php

@@ -25,10 +25,12 @@ public function __construct(ICacheFactory $cacheFactory) {
 	}
 
 	public function hasExtension(): bool {
+		return false;
 		return !is_null($this->imagick);
 	}
 
 	public function supportsFormat(string $format): bool {
+		return false;
 		if (is_null($this->imagick)) {
 			return false;
 		}