[BUG] - Training Load Graph Legend has Incorrect Colors

"Load Ratio" graph has incorrect colors if you press "Chronic Load" button. Notice how it says "Optimal Range" should be dark grey, but it's green. 

Repro steps:

1. Go to "Training Load" page
2. View "Acute Load" Graph
3. Press the "Chronic Load" button to toggle the graph
4. Notice that the legend has changed (Optimal Range went from green to dark grey and acute load went from white to grey)
5. Toggle to the "Load Ratio" graph
6. Notice the legend incorrectly shows the acute load graph legend color.