rectify python generation

Param/Distrib/ParameterDistribution.cpp

@@ -95,11 +95,11 @@ std::string ParameterDistribution::whichParameterAsPyEnum() const
 {
     switch (whichParameter()) {
     case ParameterDistribution::BeamWavelength:
-        return "ParameterDistribution::BeamWavelength";
+        return "ParameterDistribution.BeamWavelength";
     case ParameterDistribution::BeamInclinationAngle:
-        return "ParameterDistribution::BeamInclinationAngle";
+        return "ParameterDistribution.BeamInclinationAngle";
     case ParameterDistribution::BeamAzimuthalAngle:
-        return "ParameterDistribution::BeamAzimuthalAngle";
+        return "ParameterDistribution.BeamAzimuthalAngle";
     default:
         throw std::runtime_error("printParameterDistribution(): missing implementation");
     }