Workout Chart - Reset cadence during multiple training sessions

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Fixes #2251

src/Train/ErgFilePlot.cpp

@@ -545,7 +545,7 @@ ErgFilePlot::reset()
     wattsCurve->setSamples(wattsData->x(), wattsData->y(), wattsData->count());
     wbalData->clear();
     wbalCurve->setSamples(wbalData->x(), wbalData->y(), wbalData->count());
-    wbalData->clear();
+    cadData->clear();
     cadCurve->setSamples(cadData->x(), cadData->y(), cadData->count());
     hrData->clear();
     hrCurve->setSamples(hrData->x(), hrData->y(), hrData->count());