Update Todo icons in collapsed sidebar for Issues and MRs
What does this MR do?
This MR updates Todo icons in collapsed right sidebar for Issues and MRs to use icons from GitLab SVG set.
Screenshots
| Type | Before | After |
|---|---|---|
| Add todo |  |
 |
| Mark todo as done |  |
 |
Does this MR meet the acceptance criteria?
-
Changelog entry added, if necessary [ ] Documentation created/updated-
Tests added for this feature/bug -
Conforms to the code review guidelines -
Conforms to the merge request performance guidelines -
Conforms to the style guides [ ] Conforms to the database guides