Fix loading states for modals (#36)

* signing transactions and granting access should signal that buttons are working

* don't await rejection

* change from async to sync function

Author: piyalbasu

src/popup/views/SignTransaction/index.tsx

@@ -94,7 +94,7 @@ export const SignTransaction = () => {
   const publicKey = useSelector(publicKeySelector);
   const [isConfirming, setIsConfirming] = useState(false);
 
-  const rejectAndClose = async () => {
+  const rejectAndClose = () => {
     rejectAccess();
     window.close();
   };