Fix confusion matrices labeling in skills/classification/guide.ipynb

[docmparker]

This fixes the confusion matrices in the classification guide notebook. I noticed in going through the notebook that all the confusion matrices do not match the tabular results from each classification report (precision, recall, etc.). This can be easily seen in the original (current online version) by comparing the rows of the classification report to the rows of the confusion matrix. The values are correct in the classification report but not the confusion matrix in each case just based on label order (the rows/cols are just mislabeled). The fix was simple: in the evaluate function, I pass the labels to classification_report and to confusion_matrix to make sure there is consistency. I then re-ran the output for all cells with confusion matrices to have them show correctly.