Set spectrum default to log

Readme.md

@@ -4,8 +4,6 @@
 
 **Check the discussion group** [here](https://groups.io/g/sdrangel)
 
-**⚠ Warning**: Windows distribution is discontinued at version 4.0.0. This is the last version with a Windows build. 
-
 <h1>Source code</h1>
 
 <h2>Repository branches</h2>

sdrgui/gui/glspectrumgui.cpp

@@ -34,6 +34,7 @@ GLSpectrumGUI::GLSpectrumGUI(QWidget* parent) :
 	m_averagingNb(0)
 {
 	ui->setupUi(this);
+	on_linscale_toggled(false);
 	ui->refLevel->clear();
 	for(int ref = 0; ref >= -110; ref -= 5)
 		ui->refLevel->addItem(QString("%1").arg(ref));