fix(encryption): Use encrypted flag in FileInfo constructor for rawSize

Aligns with the stable34 backport (#62780): the constructor still
compared unencrypted_size against 0 instead of checking the encrypted
flag, so getSize(false) fell back to the on-disk size for zero-byte
encrypted files.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: cuppett

lib/private/Files/FileInfo.php

@@ -73,7 +73,7 @@ public function __construct($path, $storage, $internalPath, $data, $mount, $owne
 		$this->data = $data;
 		$this->mount = $mount;
 		$this->owner = $owner;
-		if (isset($this->data['unencrypted_size']) && $this->data['unencrypted_size'] !== 0) {
+		if (($this->data['encrypted'] ?? false) && isset($this->data['unencrypted_size'])) {
 			$this->rawSize = $this->data['unencrypted_size'];
 		} else {
 			$this->rawSize = $this->data['size'] ?? 0;