[ntuple] Delete move of RPageSinkBuf

Created tasks reference *this, so moving is not safe. It's also not
needed because RPageSinkBuf is always inside a std::unique_ptr.

(cherry picked from commit 672dc1a)

Author: hahnjo

tree/ntuple/inc/ROOT/RPageSinkBuf.hxx

@@ -123,8 +123,8 @@ public:
    explicit RPageSinkBuf(std::unique_ptr<RPageSink> inner);
    RPageSinkBuf(const RPageSinkBuf&) = delete;
    RPageSinkBuf& operator=(const RPageSinkBuf&) = delete;
-   RPageSinkBuf(RPageSinkBuf&&) = default;
-   RPageSinkBuf& operator=(RPageSinkBuf&&) = default;
+   RPageSinkBuf(RPageSinkBuf &&) = delete;
+   RPageSinkBuf &operator=(RPageSinkBuf &&) = delete;
    ~RPageSinkBuf() override;
 
    ColumnHandle_t AddColumn(ROOT::DescriptorId_t fieldId, RColumn &column) final;