Bias-T now works in capture mode

Simplified soundboard app, still some work to do
Merge remote-tracking branch 'upstream/master'

firmware/application/receiver_model.cpp

@@ -275,6 +275,7 @@ void ReceiverModel::update_modulation() {
 		break;
 
 	case Mode::SpectrumAnalysis:
+	case Mode::Capture:
 		break;
 	}
 }