Symlink Decorator on Folders Appearing as Bubble

[colin-grant-work]

Bug Description:

Steps to Reproduce:

1. Symlink a directory into your current workspace
2. (You may need to refresh the explorer - symlink file changes don't always trigger a refresh automatically)
3. Observe that the folder shows up in the file explorer with a bubble decoration rather than a symlink decoration.

Probably a side-effect of #10820.

Additional Information

• Operating System: MacOS, Electron
• Theia Version: master (07dcfbd)

[vince-fugnitto]

Probably a side-effect of #10820.

It's a side effect of #9473, where decorations for directories were generalized to always display the dot. We should only display the dot if the children of the directory are decorated, but if the node itself is decorated individually it should apply normally.