message: Save Dataset Modal:
  Stop clearing the selected dataset after overwritting so users can overwrite as many times as they see fit
  There's a new AsyncSelect we should use now
diff: import React, { FunctionComponent, useCallback, useState } from 'react';
  import { Radio } from 'src/components/Radio';
  -import { RadioChangeEvent, Select } from 'src/components';
  +import { RadioChangeEvent, AsyncSelect } from 'src/components';
  import { Input } from 'src/components/Input';
  import StyledModal from 'src/components/Modal';
  import Button from 'src/components/Button';
  @@ -158,7 +158,7 @@ export const SaveDatasetModal: FunctionComponent<SaveDatasetModalProps> = ({
  is_dttm: d.is_dttm,
  }),
  ),
  - datasetToOverwrite.owners.map((o: DatasetOwner) => o.id),
  + datasetToOverwrite.owners?.map((o: DatasetOwner) => o.id),
  true,
  ),
  postFormData(datasetToOverwrite.datasetid, 'table', {
  @@ -178,7 +178,6 @@ export const SaveDatasetModal: FunctionComponent<SaveDatasetModalProps> = ({
  window.open(url, '_blank', 'noreferrer');
  setShouldOverwriteDataset(false);
  - setDatasetToOverwrite({});
  setDatasetName(getDefaultDatasetName());
  };
  @@ -359,7 +358,7 @@ export const SaveDatasetModal: FunctionComponent<SaveDatasetModalProps> = ({
  {t('Overwrite existing')}
  </Radio>
  <div className="sdm-autocomplete">
  - <Select
  + <AsyncSelect
  allowClear
  showSearch
  placeholder={t('Select or type dataset name')}
  