Revert "Change condition from source subproc id = 0 to sample rate = 0 (simpler)"

This reverts commit bdd664f.

Author: ethanbb

Plugins/LfpDisplayNode/LfpDisplayNode.cpp

@@ -271,8 +271,8 @@ void LfpDisplayNode::handleEvent(const EventChannel* eventInfo, const MidiMessag
         const int eventTime = samplePosition;
         uint32 eventSourceNodeId = getEventSourceId(eventInfo);
 
-        // treat event channels with sample rate of 0 as occurring on the subprocessor being drawn.
-        if (eventInfo->getSampleRate() == 0)
+        // treat events with no source as occurring on the subprocessor being drawn.
+        if (eventSourceNodeId == 0)
         {
             eventSourceNodeId = subprocessorToDraw;
         }