ModelEditor: Use more member initializers in modelinglib

Change-Id: I8e0a93e0b83c45e0e8c20a92657340b24a346849
Reviewed-by: André Hartmann <aha_1980@gmx.de>

src/libs/modelinglib/qmt/model/mitem.cpp

@@ -31,9 +31,6 @@
 namespace qmt {
 
 MItem::MItem()
-    : MObject(),
-      m_isVarietyEditable(true),
-      m_isShapeEditable(false)
 {
 }