cleanup axis items

GUI/Model/Axis/AmplitudeAxisItem.cpp

@@ -93,7 +93,7 @@ void AmplitudeAxisItem::readFrom(QXmlStreamReader* r)
             m_log_range_orders = XML::readDouble(r, XML::Attrib::value);
             XML::gotoEndElementOfTag(r, tag);
 
-           // visibility?
+            // visibility?
         } else if (tag == Tag::IsVisible) {
             m_visible = XML::readBool(r, XML::Attrib::value);
             XML::gotoEndElementOfTag(r, tag);