Removed not needed stylesheet properties

GUI/View/Fit/MinimizerSettingsWidget.cpp

GUI/View/Import/RealDataSelectorWidget.cpp

GUI/View/Instrument/AxisPropertyEditor.cpp

GUI/View/Instrument/DistributionEditor.cpp

GUI/View/Instrument/FootprintCorrectionEditor.cpp

GUI/View/Instrument/InclinationAnglesEditor.cpp

GUI/View/Instrument/InstrumentLibraryEditor.cpp

GUI/View/Instrument/InstrumentView.cpp

GUI/View/Instrument/RectangularDetectorEditor.cpp

GUI/View/Instrument/ResolutionFunctionEditor.cpp

GUI/View/Mask/MaskEditorPropertyPanel.cpp

GUI/View/PlotUtil/DataPropertyWidget.cpp

GUI/View/SampleDesigner/LayerOrientedSampleEditor.cpp

GUI/View/Tool/GroupBoxCollapser.cpp

GUI/View/Toplevel/SimulationView.cpp

GUI/View/Toplevel/WelcomeView.cpp