fix(GenerateBlurhashMetadata): Suppress imagescale errors

Suppress errors in imagescale during file-scans:
Most of these errors are caused by out of range x/y-dims.

Triggering un unhandled exception, metadata-generation aborts at this point  (e.g. occ files:scan --generate-metadata), effectively preventing these images from being added to photos or maps.

This problem might be the root cause for an issue described here:
nextcloud/photos#2768

Signed-off-by: umgfoin <umgfoin@users.noreply.github.com>

Author: umgfoin

lib/private/Blurhash/Listener/GenerateBlurhashMetadata.php

@@ -98,7 +98,7 @@ private function resizedImageFromFile(File $file): GdImage|false {
 			$newX = intval($currX * $newY / $currY);
 		}
 
-		$newImage = imagescale($image, $newX, $newY);
+		$newImage = @imagescale($image, $newX, $newY);
 		return ($newImage !== false) ? $newImage : $image;
 	}