Correct migration reference

(cherry picked from commit ab829620)

aleksis/core/migrations/0047_add_room_model.py

@@ -25,7 +25,7 @@ class Migration(migrations.Migration):
         recorder = migrations.recorder
         applied = False
         try:
-            applied = recorder.MigrationRecorder.Migration.objects.filter(app="core", name="0046_add_room_model").exists()
+            applied = recorder.MigrationRecorder.Migration.objects.filter(app="core", name="0047_add_room_model").exists()
         except ProgrammingError:
             applied = False
         if not applied: