Fix ReactAdmin console warnings

ui/src/personal/Personal.js

@@ -22,10 +22,10 @@ const Personal = () => {
   return (
     <Card className={classes.root}>
       <Title title={'Navidrome - ' + translate('menu.personal')} />
-      <SimpleForm toolbar={false}>
+      <SimpleForm toolbar={null}>
         <SelectInput
           source="theme"
-          initialValue={currentTheme}
+          defaultValue={currentTheme}
           choices={themeChoices}
           onChange={(event) => {
             dispatch(changeTheme(event.target.value))

ui/src/transcoding/TranscodingCreate.js

@@ -32,7 +32,7 @@ const TranscodingCreate = (props) => (
           { id: 256, name: '256' },
           { id: 320, name: '320' }
         ]}
-        initialValue={192}
+        defaultValue={192}
       />
       <TextInput
         source="command"

ui/src/user/UserCreate.js

@@ -17,7 +17,7 @@ const UserCreate = (props) => (
       <TextInput source="name" validate={[required()]} />
       <TextInput source="email" validate={[required(), email()]} />
       <PasswordInput source="password" validate={[required()]} />
-      <BooleanInput source="isAdmin" initialValue={false} />
+      <BooleanInput source="isAdmin" defaultValue={false} />
     </SimpleForm>
   </Create>
 )