Fixes copy constructor in OptionalBorrowedPtr being broken.

src/Memory/__OptionalBorrowedPtr.hpp

@@ -19,7 +19,7 @@ namespace ArbUt {
         /// @brief Initialise a BorrowedPtr with a specific raw pointer.
         inline OptionalBorrowedPtr<T>(T* ptr) : _raw(ptr){};
         /// @brief Initialise a BorrowedPtr from a copy.
-        inline OptionalBorrowedPtr<T>(const BorrowedPtr<T>& other) : _raw(other._raw){};
+        inline OptionalBorrowedPtr<T>(const OptionalBorrowedPtr<T>& other) : _raw(other._raw){};
         /// @brief Initialise a BorrowedPtr with a std unique_ptr.
         inline OptionalBorrowedPtr<T>(const std::unique_ptr<T>& other) : _raw(other.get()){};