in connect-to-lambda statements, omit pointless 'this' argument

GUI/Model/Model/FitParameterModel.cpp

GUI/Model/Sample/MaterialModel.cpp

GUI/View/Access/DataAccessWidget.cpp

GUI/View/Combo/ItemComboWidget.cpp

GUI/View/Fit/FitSessionManager.cpp

GUI/View/FitControl/RunFitControlWidget.cpp

GUI/View/JobControl/JobListModel.cpp

GUI/View/JobControl/JobListing.cpp

GUI/View/JobControl/JobPropertiesTableModel.cpp

GUI/View/JobControl/JobPropertiesWidget.cpp

GUI/View/Main/ActionManager.cpp

GUI/View/Plotter/ProjectionsPlot.cpp

GUI/View/Plotter/SpecularPlot.cpp