Start using the new modal component

This attempts to converge all our modals on the new modal component while changing their designs as little as possible. This should reduce the bundle size a bit and make the app generally feel like it's converging on the new designs, even though individual modals still remain to be revamped.

src/home/UnauthenticatedView.tsx

@@ -30,7 +30,6 @@ import {
   sanitiseRoomNameInput,
 } from "../matrix-utils";
 import { useInteractiveRegistration } from "../auth/useInteractiveRegistration";
-import { useModalTriggerState } from "../Modal";
 import { JoinExistingCallModal } from "./JoinExistingCallModal";
 import { useRecaptcha } from "../auth/useRecaptcha";
 import { Body, Caption, Link } from "../typography/Typography";
@@ -55,7 +54,12 @@ export const UnauthenticatedView: FC = () => {
   const { recaptchaKey, register } = useInteractiveRegistration();
   const { execute, reset, recaptchaId } = useRecaptcha(recaptchaKey);
 
-  const { modalState, modalProps } = useModalTriggerState();
+  const [joinExistingCallModalOpen, setJoinExistingCallModalOpen] =
+    useState(false);
+  const onDismissJoinExistingCallModal = useCallback(
+    () => setJoinExistingCallModalOpen(false),
+    [setJoinExistingCallModalOpen]
+  );
   const [onFinished, setOnFinished] = useState<() => void>();
   const history = useHistory();
   const { t } = useTranslation();
@@ -110,7 +114,7 @@ export const UnauthenticatedView: FC = () => {
             });
 
             setLoading(false);
-            modalState.open();
+            setJoinExistingCallModalOpen(true);
             return;
           } else {
             throw error;
@@ -139,7 +143,7 @@ export const UnauthenticatedView: FC = () => {
       execute,
       history,
       callType,
-      modalState,
+      setJoinExistingCallModalOpen,
       setClient,
       e2eeEnabled,
     ]
@@ -235,8 +239,12 @@ export const UnauthenticatedView: FC = () => {
           </Body>
         </footer>
       </div>
-      {modalState.isOpen && onFinished && (
-        <JoinExistingCallModal onJoin={onFinished} {...modalProps} />
+      {onFinished && (
+        <JoinExistingCallModal
+          onJoin={onFinished}
+          open={joinExistingCallModalOpen}
+          onDismiss={onDismissJoinExistingCallModal}
+        />
       )}
     </>
   );