Sas: Default to the right preset in reverb.

This needs to match waveformEffect.type, which is the default on the PSP.

Otherwise, setting to OFF initially does nothing, and it remains ROOM.

Core/HW/SasReverb.cpp

@@ -152,7 +152,7 @@ static const SasReverbData presets[10] = {
 	},
 };
 
-SasReverb::SasReverb() : preset_(0), pos_(0) {
+SasReverb::SasReverb() : preset_(-1), pos_(0) {
 	workspace_ = new int16_t[BUFSIZE];
 }
 
@@ -161,6 +161,9 @@ SasReverb::~SasReverb() {
 }
 
 const char *SasReverb::GetPresetName(int preset) {
+	if (preset == -1) {
+		return "Off";
+	}
 	return presets[preset].name;
 }