Use default RRD colors that are a little more visually distinct.

RRD changes in commits:

7523c8e946de30c63f9b8f57bd5e91cb0617a9f1 
97f544d7e59ebebaf9d434f67878d671c6ca5275
3ed917c7241b76eb6889ab75ddafb87e975a61db

missed this theme off. This brings in back in line.