Icons are not visible in dark theme
### Expected Behavior
Action Screen icons should be visible (ie light color) in dark theme
### Current Behavior
Action icons are black on dark background and thus not visible in the dark theme
### Possible Solutions
The icons seem to be image based so you could add a css filter rule to the icon classes for example:
.icon {
filter: invert(1);
}
Alternatively allow users to paste SVG markup to use as icons.
### Steps to Reproduce
1. Choose Dark Theme for Widget
2. Use Action Screen as Widget Home Screen
3. Add Actions with icons
4. The icons are black
### Context (Environment)
Not only does it look very unprofessional, icons are actually a very important way to quickly convey an action in a visual way, especially to non-native english speakers.