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Swap diagnostic positions in basic_json::swap() (#5493)

basic_json::swap() (and the friend swap() that forwards to it) only
exchanged m_data.m_type/m_data.m_value, leaving start_position/end_position
untouched under JSON_DIAGNOSTIC_POSITIONS. This is inconsistent with
copy-assignment's operator=(basic_json), which swaps positions as part of
its copy-and-swap implementation, so after swap(a, b) each value ended up
with the other value's content but its own original position.

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

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