change keybinding for changing browse mode

I shouldn't do that, but the old one will be much better for
choosing whether songs in browser have to be sorted by names
or modification date. Besides, binding this to browser key
makes browser behaviour more "compatible" with media library.

src/browser.cpp

@@ -72,7 +72,12 @@ void Browser::Resize()
 void Browser::SwitchTo()
 {
 	if (myScreen == this)
+	{
+#		ifndef WIN32
+		myBrowser->ChangeBrowseMode();
+#		endif // !WIN32
 		return;
+	}
 	
 	if (!isInitialized)
 		Init();