chore: ModalBasedOnMemberCount 컴포넌트를 Modal/index.ts에 추가

client/src/components/Modal/index.ts

@@ -1,3 +1,4 @@
 export {default as SetActionListModal} from './SetActionModal/SetActionListModal';
 export {default as SetInitialMemberListModal} from './SetInitialMemberListModal/SetInitialMemberListModal';
 export {default as SetAllMemberListModal} from './SetAllMemberListModal/SetAllMemberListModal';
+export {default as ModalBasedOnMemberCount} from './ModalBasedOnMemberCount/ModalBasedOnMemberCount';

client/src/pages/EventPage/AdminPage/AdminPage.tsx

@@ -5,7 +5,7 @@ import StepList from '@components/StepList/StepList';
 import {useStepList} from '@hooks/useStepList/useStepList';
 import {requestGetEventName} from '@apis/request/event';
 import useEventId from '@hooks/useEventId/useEventId';
-import ModalBasedOnMemberCount from '@components/Modal/ModalBasedOnMemberCount/ModalBasedOnMemberCount';
+import {ModalBasedOnMemberCount} from '@components/Modal/index';
 
 import {receiptStyle, titleAndListButtonContainerStyle} from './AdminPage.style';