[j.0] revert Detector2D c'tor to old argument list ()

Device/Detector/Detector2D.cpp

Device/Detector/Detector2D.h

GUI/Model/Detector/DetectorItem.cpp

Sim/Export/SimulationToPython.cpp

Tests/Functional/Fitting/FittingTests.cpp

Tests/Py/Fit/fitobjective_api.py

Tests/Py/Functional/PyFuTestInfrastructure.py

Tests/SimFactory/MakeSimulations.cpp

Tests/Unit/Device/Detector2DTest.cpp

Tests/Unit/Device/RegionOfInterestTest.cpp

Tests/Unit/Sim/FittingTestHelper.h

Wrap/Python/src/bornagain/std_simulations.py

auto/Examples/fit/scatter2d/consecutive_fitting.py

auto/Examples/fit/scatter2d/expfit_galaxi.py

auto/Examples/fit/scatter2d/fit2d.py

auto/Examples/fit/scatter2d/gisas_model1.py

auto/Examples/fit/scatter2d/minimizer_settings.py

auto/Examples/fit/scatter2d/model1_cylinders.py

auto/Examples/fit/scatter2d/model2_hexlattice.py

auto/Examples/fit/scatter2d/multiple_datasets.py