Fix warnings on Windows for the Local Rx Filter

Summary

This MR fixes the warnings introduced by the local Rx filter.

Rationale

We have the following loop :

for (int y = -externalRadius[1]; y <= static_cast<int>(externalRadius[1]); y++)
      {
      off[1] = y;
      for (int x = -externalRadius[0]; x <= static_cast<int>(externalRadius[0]); x++)
        {
        off[0] = x;
        if ((abs(x) > internalRadiusX) || (abs(y) > internalRadiusY))
          {
            listSample->PushBack(in.GetPixel(off));
          }
        }
      }

where externalRadius[1] is of type unsigned int.

On Linux it's ok, but on Windows we have warnings because exteralRadius is not casted to int. Note that the tests are not failing because we are lucky with the overflow.

This MR add the required static casts

Copyright

The copyright owner is CNES and has signed the ORFEO ToolBox Contributor License Agreement.

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