Set relative alpha/tint instead of global in Svg::draw(), and ModuleWidget when bypassed.

src/app/ModuleWidget.cpp

@@ -523,7 +523,7 @@ void ModuleWidget::draw(const DrawArgs& args) {
 	nvgScissor(args.vg, RECT_ARGS(args.clipBox));
 
 	if (module && module->isBypassed()) {
-		nvgGlobalAlpha(args.vg, 0.33);
+		nvgAlpha(args.vg, 0.33);
 	}
 
 	Widget::draw(args);

src/svg.cpp

@@ -176,7 +176,7 @@ void svgDraw(NVGcontext* vg, NSVGimage* svg) {
 
 		// Opacity
 		if (shape->opacity < 1.0)
-			nvgGlobalAlpha(vg, shape->opacity);
+			nvgAlpha(vg, shape->opacity);
 
 		// Build path
 		nvgBeginPath(vg);