Refs #14417. Remove duplicate colormap.

MantidQt/API/src/MdConstants.cpp

@@ -37,7 +37,7 @@ namespace MantidQt
       m_defaultBackgroundColor = QColor(84,89,109);
 
       // Populate the optional color maps
-      m_vsiColorMaps.append("Viridis");
+      m_vsiColorMaps.append("Viridis (matplotlib)");
       m_vsiColorMaps.append("Cool to Warm");
       m_vsiColorMaps.append("Blue to Red Rainbow");
       m_vsiColorMaps.append("Red to Blue Rainbow");

MantidQt/API/src/MdPlottingCmapsProvider.cpp

@@ -60,9 +60,9 @@ namespace MantidQt{
 #ifdef MAKE_VATES
       vtkNew<vtkSMTransferFunctionPresets> presets;
 
-      // Check for colormap "Viridis". If preset, assume custom colormaps have
+      // Check for colormap "hot". If preset, assume custom colormaps have
       // already been loaded.
-      auto viridisColormap = presets->GetFirstPresetWithName("Viridis");
+      auto viridisColormap = presets->GetFirstPresetWithName("hot");
       if (viridisColormap.empty()) {
         const std::string filenames[3] = {"All_slice_viewer_cmaps_for_vsi.json",
                                           "All_idl_cmaps.json",