Fix a memory leak in Nightscout chart #3524
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The chart would create SVG objects for treatment event records, then later recreate them without deleting the old ones. This resulted in a huge number of duplicates accumulating, which (in my setup) would cause a crash due to excessive memory usage and DOM size in about a day.
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This is for testing #3500 in the autotune branch (because that's what I'm running).