file_sys/patch_manager: Add missing include

Fixes build issues

src/core/file_sys/patch_manager.h

@@ -6,6 +6,7 @@
 
 #include <map>
 #include <memory>
+#include <optional>
 #include <string>
 #include "common/common_types.h"
 #include "core/file_sys/nca_metadata.h"