fix(PatternStopCard.js): Fix flow issue

#663

Author: Rob Gregg

lib/editor/components/pattern/PatternStopCard.js

@@ -22,7 +22,6 @@ import NormalizeStopTimesTip from './NormalizeStopTimesTip'
 import PatternStopButtons from './PatternStopButtons'
 
 import type {Feed, Pattern, PatternStop} from '../../../types'
-import { string } from 'jszip/lib/support'
 
 type Props = {
   _onPickupOrDropOffChange: () => void,