Minor : fix little gui defect

At opening of terminal strip editor window, click on free terminal
in the tree dock don't show up the free terminal table.

sources/TerminalStrip/ui/terminalstriptreedockwidget.h

@@ -78,6 +78,7 @@ class TerminalStripTreeDockWidget : public QDockWidget
 		QHash<QUuid, QSharedPointer<RealTerminal>> m_uuid_terminal_H;
 		QHash<QUuid, QPointer<TerminalStrip>> m_uuid_strip_H;
 		QVector<QMetaObject::Connection> m_strip_changed_connection;
+		bool m_current_is_free_terminal{false};
 };
 
 #endif // TERMINALSTRIPTREEDOCKWIDGET_H