Update MIDI.hpp

- added if statement asking for "useRunningStatus", as it caused a bug 
with a certain midi device, causing the arduino to resolve the same midi 
data multiple times. I think it was forgotten here, as the comment also 
suggests that this section is only for "if enabled..."

src/MIDI.hpp

@@ -911,6 +911,8 @@ bool MidiInterface<SerialPort, Settings>::parse()
             mMessage.valid = true;
 
             // Activate running status (if enabled for the received type)
+            if (Settings::UseRunningStatus) {
+
                 switch (mMessage.type)
                 {
 	                    case NoteOff:
@@ -929,6 +931,13 @@ bool MidiInterface<SerialPort, Settings>::parse()
 	                    mRunningStatus_RX = InvalidType;
 	                    break;
                 }
+            }
+
+            else {
+
+                mRunningStatus_RX = InvalidType;
+            }
+
             return true;
         }
         else