LibPDF: Attempt to unecrypt strings and streams

Author: https://github.com/mattco98
Commit: 4e81663b31
Pull-request: https://github.com/SerenityOS/serenity/pull/13204

Userland/Libraries/LibPDF/Parser.h

@@ -146,6 +146,7 @@ private:
     RefPtr<DictObject> m_trailer;
     Optional<LinearizationDictionary> m_linearization_dictionary;
     Vector<Reference> m_current_reference_stack;
+    bool m_disable_encryption { false };
 };
 
 };