Use outlined Material-UI variant for all inputs

ui/src/playlist/PlaylistCreate.js

@@ -9,7 +9,7 @@ import {
 
 const PlaylistCreate = (props) => (
   <Create {...props}>
-    <SimpleForm redirect="list">
+    <SimpleForm redirect="list" variant={'outlined'}>
       <TextInput source="name" validate={required()} />
       <TextInput multiline source="comment" />
       <BooleanInput source="public" initialValue={true} />

ui/src/playlist/PlaylistEdit.js

@@ -21,7 +21,7 @@ const SyncFragment = ({ formData, ...rest }) => {
 
 const PlaylistEdit = (props) => (
   <Edit {...props}>
-    <SimpleForm redirect="list">
+    <SimpleForm redirect="list" variant={'outlined'}>
       <TextInput source="name" validate={required()} />
       <TextInput multiline source="comment" />
       <BooleanInput source="public" />

ui/src/playlist/PlaylistList.js

@@ -15,7 +15,7 @@ import { DurationField, List } from '../common'
 import Writable, { isWritable } from '../common/Writable'
 
 const PlaylistFilter = (props) => (
-  <Filter {...props}>
+  <Filter {...props} variant={'outlined'}>
     <SearchInput source="name" alwaysOn />
   </Filter>
 )