frontend: Fix missing save() call (Django 1.8 change)

[18:51:48] <OatmealDome> I think it might be fixable if t.save() is put here https://github.com/dolphin-emu/fifoci/blob/master/frontend/fifoci/management/commands/import_results.py#L64

From the Django 1.8 docs:

> Assigning unsaved objects to a ForeignKey, GenericForeignKey, and OneToOneField now raises a ValueError.

Fixes a latent issue that has been present since the Django 1.7 -> 1.10
update back in 2017.

frontend/fifoci/management/commands/import_results.py

@@ -61,6 +61,7 @@ def import_result(type, ver, parent, zf, dff_short_name, result):
     except Type.DoesNotExist:
         t = Type()
         t.type = type
+        t.save()
 
     try:
         r = Result.objects.get(dff=dff, ver=ver, type=t)