Bug: Color Mapping: Graph + Single Stat is missing this feature

The Graph + Single Stat visualization has inconsistent colors. The single stat's color does not match its line color. It seems like the colorMapping feature in Graphs is not being used for Graph + Single Stat.

Steps to reproduce:
1. Navigate to the old Data Explorer
1. Select Graph + Single Stat as the visualization
1. Make a valid query and submit.
1. Notice that the color of the Single Stat matches its line color.
1. Click on Customize.
1. Use the Line Colors dropdown and select any color scheme, including the current color scheme.
1. Notice the color of the Single Stat no longer matches its line color.

https://user-images.githubusercontent.com/10736577/192898075-866fa05c-58c0-4fd1-a79e-b15498d86576.mp4