fix: don't hard-refresh the page on preview updates

Author: angeloashmore

src/PrismicPreviewClient.tsx

@@ -68,7 +68,8 @@ export function PrismicPreviewClient(props: PrismicPreviewClientProps): null {
 				});
 		}
 
-		function onUpdate() {
+		function onUpdate(event: Event) {
+			event.preventDefault();
 			refresh();
 		}