GREG-100: Fixing linting errors

frontend/src/routes/sponsor/frontpage/index.tsx

@@ -23,6 +23,7 @@ import SponsorGuestButtons from '../../components/sponsorGuestButtons'
 
 interface GuestProps {
   persons: Guest[]
+  // eslint-disable-next-line react/no-unused-prop-types
   cancelCallback?: (roleId: string) => void
 }
 
@@ -176,6 +177,11 @@ const WaitingForGuestRegistration = ({
   )
 }
 
+WaitingForGuestRegistration.defaultProps = {
+  // eslint-disable-next-line @typescript-eslint/no-unused-vars
+  cancelCallback: (roleId: number) => {},
+}
+
 const ActiveGuests = ({ persons }: GuestProps) => {
   const [activeExpanded, setActiveExpanded] = useState(false)
 
@@ -243,6 +249,11 @@ const ActiveGuests = ({ persons }: GuestProps) => {
   )
 }
 
+ActiveGuests.defaultProps = {
+  // eslint-disable-next-line @typescript-eslint/no-unused-vars
+  cancelCallback: (roleId: number) => {},
+}
+
 const WaitingGuests = ({ persons }: GuestProps) => {
   const [waitingExpanded, setWaitingExpanded] = useState(false)
 
@@ -305,6 +316,11 @@ const WaitingGuests = ({ persons }: GuestProps) => {
   )
 }
 
+WaitingGuests.defaultProps = {
+  // eslint-disable-next-line @typescript-eslint/no-unused-vars
+  cancelCallback: (roleId: number) => {},
+}
+
 interface FrontPageProps {
   guests: Guest[]
   cancelRole: (roleId: string) => void