Refactor DownloadMenuDialog to use useTranscodingOptions hook

ui/src/transcoding/TranscodingCreate.js

@@ -8,6 +8,7 @@ import {
   useTranslate,
 } from 'react-admin'
 import { Title } from '../common'
+import { BITRATE_CHOICES } from '../consts'
 
 const TranscodingTitle = () => {
   const translate = useTranslate()
@@ -27,19 +28,7 @@ const TranscodingCreate = (props) => (
       <TextInput source="targetFormat" validate={[required()]} />
       <SelectInput
         source="defaultBitRate"
-        choices={[
-          { id: 32, name: '32' },
-          { id: 48, name: '48' },
-          { id: 64, name: '64' },
-          { id: 80, name: '80' },
-          { id: 96, name: '96' },
-          { id: 112, name: '112' },
-          { id: 128, name: '128' },
-          { id: 160, name: '160' },
-          { id: 192, name: '192' },
-          { id: 256, name: '256' },
-          { id: 320, name: '320' },
-        ]}
+        choices={BITRATE_CHOICES}
         defaultValue={192}
       />
       <TextInput