Visualization, Image_AlienPixMap - do not write comment into binary PPM image

This comment is not skipped by some Linux image readers (including GIMP)
and display image corrupted (shifted colors, etc.).

src/Image/Image_AlienPixMap.cxx

@@ -1033,7 +1033,6 @@ bool Image_AlienPixMap::savePPM(const TCollection_AsciiString& theFileName) cons
 
   // Write header
   fprintf(aFile, "P6\n%d %d\n255\n", (int)SizeX(), (int)SizeY());
-  fprintf(aFile, "# Image stored by OpenCASCADE framework in linear RGB colorspace\n");
 
   // Write pixel data
   Standard_Byte aByte;