Previously only adding an aux-send triggered a graph-reorder but copying
or deleting sends did nothing.
Adding/removing an aux-send may not even change the graph, but
both upstream/downstream latency can change and delaylines need to be
configured (which is done by calling update_latency_compensation with
force_whole_graph = true).
This fixes an issue with incorrect initial latency compensation after
copying a send (any later change to connections will correctly
recalculate it).
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