remove options from footer observer

explore/src/app/app.component.ts

@@ -135,11 +135,6 @@ export class AppComponent {
 	}
 
 	createObservers() {
-		let options = {
-			root: null,
-			rootMargin: '300px',
-			threshold: 1.0
-		};
 		let intersectionObserver = new IntersectionObserver(entries => {
 			entries.forEach(entry => {
         if (entry.isIntersecting && this.showQuickContact) {
@@ -150,7 +145,7 @@ export class AppComponent {
           this.quickContactService.setDisplay(this.showQuickContact);
         }
       });
-		}, options);
+		});
 		intersectionObserver.observe(this.bottom.nativeElement);
 		this.subscriptions.push(intersectionObserver);
 	}