Change local layer styles to lib styles is broken
I want to merge my local styles with that of an external lib. Atomate just recognized one of the around 5 or 6 colors to merge others doesn't appear in the list, screenshot attached.

Left the lib styles on the right the local file. You see the "success" green filled won't appear in the list.

![image](https://user-images.githubusercontent.com/13254959/94434182-aa141900-0199-11eb-9ebd-8c28bb5a9714.png)
