Fix presets being set and state restore

I'm not sure if preset handling will be totally correct since the
parameters would not be notifying the hosts depending on how they are
called.

`RNBO::JuceAudioProcessor::setCurrentProgram` does not set
`_isSettingPresetAsync` as far as I can tell.

This fixes the test suite referenced in Cycling74#2.

Closes Cycling74#2.

- https://github.com/Cycling74/rnbo.adapter.juce/blob/dd233609adc495828fa9efcf756ab2a155a3bd1d/RNBO_JuceAudioProcessor.cpp#L412-L421

RNBO_JuceAudioProcessor.cpp

@@ -243,6 +243,9 @@ void JuceAudioProcessor::handleParameterEvent(const ParameterEvent& event)
 			param->setValueNotifyingHost((float)normalizedValue);
 			param->endChangeGesture();
 		}
+		else {
+			param->setValue((float)normalizedValue);
+		}
 	}
 }