Do not shrink the output of dump()

finish() copied the whole output when the buffer was more than twice as
large as the result (citm dump +11%). The tighter source_extent()
estimate already keeps the buffer of a small value small.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

include/nlohmann/detail/view/serializer.hpp

@@ -46,11 +46,6 @@ class output_buffer
     {
         const auto size = static_cast<std::size_t>(m_pos - m_out.data());
         m_out.resize(size);
-        // do not keep a buffer that was sized for a much larger output
-        if (m_out.capacity() > 1024 && m_out.capacity() / 2 > size)
-        {
-            m_out.shrink_to_fit();
-        }
     }
 
     NLOHMANN_VIEW_ALWAYS_INLINE void reserve(std::size_t n)