ScxmlEditor: Fix compilation

Change-Id: I8810a4e820abdee3983925bb9cd4685c6b14fbd0
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/scxmleditor/common/structure.cpp

@@ -43,7 +43,7 @@
 #include <QLineEdit>
 #include <QRegExp>
 #include <QRegExpValidator>
-#include <QToolbar>
+#include <QToolBar>
 #include <QToolButton>
 #include <QUndoStack>