Update loading spinner style

Author: limcaaarl

frontend/src/app/questions/questions.component.html

@@ -4,7 +4,6 @@
         *ngIf="loading"
         styleClass="w-4rem h-4rem"
         strokeWidth="8"
-        fill="var(--surface-ground)"
         animationDuration=".5s" />
     <p-toast />
     <ng-container *ngIf="!loading">