[UI/UX:CourseMaterials] Change course materials icon (#8391)
[UI/UX:CourseMaterials] Change course materials icon (#8391)

Change course materials icon
Submitty/Submitty,Submitty/Submitty,Submitty/Submitty,Submitty/Submitty,Submitty/Submitty,Submitty/Submitty,Submitty/Submitty,Submitty/Submitty,Submitty/Submitty