ROENROLL-1542 fix past courses missing gray background

src/app/degree-planner/shared/course-item/course-item.component.html

-<div 
-  class="course-item {{ disabled ? 'disabled' : '' }}{{ status | lowercase }}" 
+<div
+  class="course-item {{ disabled ? 'disabled' : '' }} {{ status | lowercase }}"
   isFocusable="true"
-  isTabbable="true" 
+  isTabbable="true"
   tabindex="0"
   (click)="openCourseDetailsDialog()"
   (keyup)="detectEnter($event)">