Revert "fix: Disable imagick preview providers"

This reverts commit 432d746.

Signed-off-by: Benjamin Gaussorgues <benjamin.gaussorgues@nextcloud.com>

Author: Altahrim

lib/private/PreviewManager.php

@@ -401,8 +401,7 @@ protected function registerCoreProviders() {
 		$this->registerCoreProvider(Preview\Imaginary::class, Preview\Imaginary::supportedMimeTypes());
 
 		// SVG, Office and Bitmap require imagick
-		/** @psalm-suppress TypeDoesNotContainType */
-		if (false) {
+		if (extension_loaded('imagick')) {
 			$checkImagick = new \Imagick();
 
 			$imagickProviders = [