refactor: 조사매물 메모 placeholder 제거

src/components/survey-sale/detail/RoofForm.tsx

@@ -492,7 +492,6 @@ export default function RoofForm(props: {
                   className="textarea-form"
                   name="memo"
                   id="memo"
-                  placeholder="TextArea Filed"
                   value={roofInfo?.memo ?? ''}
                   disabled={mode === 'READ'}
                   onChange={(e) => setRoofInfo({ ...roofInfo, memo: e.target.value })}