MF-658: set default DOB to blank (#31)

Author: walteronoh

packages/esm-patient-registration-app/src/patient-registration/field/dob/dob.component.tsx

@@ -28,7 +28,7 @@ export const DobField: React.FC = () => {
           invalid={!!(meta.touched && meta.error)}
           invalidText={meta.error}
           {...field}
-          value={format(new Date(field.value))}
+          value={format(field.value)}
         />
       </DatePicker>
     </div>