[admin] Use raw ids where possible and simplify scrobble inlines

vrobbler/apps/profiles/admin.py

@@ -6,6 +6,7 @@ from profiles.models import UserProfile
 @admin.register(UserProfile)
 class UserProfileAdmin(admin.ModelAdmin):
     date_hierarchy = "created"
+    raw_id_fields = ("user",)
     ordering = ("-created",)
     readonly_fields = ("timezone_change_log",)
     exclude = (