With the recent change for labels to be black when not active/selected,
the hardcoded colors of missing media/data-blocks make it hard to read.
- Use a lighter color just like muted strips.
- Makes active/selected muted strips draw labels in full opacity, for consistency.
- Make muted strips a little less gray (50% instead of 80%)
Pull Request: https://projects.blender.org/blender/blender/pulls/123494
8cb0b347ae