Don't draw BB editor inside Song Editor (#5988)

* Don't draw BB editor inside Song Editor

Currently, a small BB editor is drawn inside the Song Editor at high zoom levels. As discussed in #3060 this is unintuitive and appears broken (I've seen several other reports of this as a bug). This PR removes this behavior.

* Make removal optional

include/PatternView.h

@@ -92,6 +92,8 @@ private:
 	QColor m_mutedNoteBorderColor;
 
 	QStaticText m_staticTextName;
+	
+	bool m_legacySEBB;
 } ;