[Tutorial] Fix int8_t configurables (AliceO2Group#8524)

Author: vkucera

Tutorials/ML/applyMlSelection.cxx

@@ -39,7 +39,7 @@ struct applyMlSelection {
   Configurable<std::vector<double>> binsPtMl{"binsPtMl", std::vector<double>{1., 36.}, "pT bin limits for ML application"};
   Configurable<std::vector<int>> cutDirMl{"cutDirMl", std::vector<int>{cuts_ml::CutSmaller, cuts_ml::CutNot, cuts_ml::CutNot}, "Whether to reject score values greater or smaller than the threshold"};
   Configurable<LabeledArray<double>> cutsMl{"cutsMl", {defaultCutsMl[0], 1, 3, {"pT bin 0"}, {"score prompt", "score non-prompt", "score bkg"}}, "ML selections per pT bin"};
-  Configurable<int8_t> nClassesMl{"nClassesMl", (int8_t)3, "Number of classes in ML model"};
+  Configurable<int> nClassesMl{"nClassesMl", 3, "Number of classes in ML model"};
   // Model file names
   Configurable<std::vector<std::string>> onnxFileNames{"onnxFileNames", std::vector<std::string>{"model_onnx.onnx"}, "ONNX file names for each pT bin (if not from CCDB full path)"};
   // Bonus: CCDB configuration (needed for ML application on the GRID)