Replace pcl::visualization::createPlane and pcl::visualization::PCLVisualizer::addPlane overloads by default arguments

The code is pretty similar and can be probably reduced by simply making a change to its signature with default initializers.

bool addPlane (const pcl::ModelCoefficients &coefficients, 
               double x = 0,
               double y = 0,
               double z = 0,
               const std::string &id = "plane",
               int viewport = 0);

and

PCL_EXPORTS vtkSmartPointer<vtkDataSet> 
createPlane (const pcl::ModelCoefficients &coefficients, double x = 0, double y = 0, double z = 0);

pcl::visualization::PCLVisualizer::addPlane method:

• Signature 1
• Signature 2

pcl::visualization::createPlane method:

• Signature 1
• signature 2