Use raw_id_fields to avoid selecting all users

In most applications, there are many users, this will lead to a non performant admin page if you want to modify or add a new token.

rest_framework/authtoken/admin.py

@@ -3,10 +3,9 @@ from django.contrib import admin
 from rest_framework.authtoken.models import Token
 
 
+@admin.register(Token)
 class TokenAdmin(admin.ModelAdmin):
     list_display = ('key', 'user', 'created')
     fields = ('user',)
     ordering = ('-created',)
-
-
-admin.site.register(Token, TokenAdmin)
+    raw_id_fields = ('user',)