billing: Fix exempt_from_from_license_number_check column name.

exempt_from_from_license_number_check was clearly not intended.

corporate/lib/registration.py

@@ -72,11 +72,7 @@ def check_spare_licenses_available_for_adding_new_users(
     realm: Realm, extra_non_guests_count: int = 0, extra_guests_count: int = 0
 ) -> None:
     plan = get_current_plan_by_realm(realm)
-    if (
+    if plan is None or plan.automanage_licenses or plan.customer.exempt_from_license_number_check:
-        plan is None
-        or plan.automanage_licenses
-        or plan.customer.exempt_from_from_license_number_check
-    ):
         return
 
     if plan.licenses() < get_seat_count(

corporate/migrations/0017_rename_exempt_from_from_license_number_check_customer_exempt_from_license_number_check.py

@@ -0,0 +1,17 @@
+# Generated by Django 4.2 on 2023-04-10 18:22
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("corporate", "0016_customer_add_remote_server_field"),
+    ]
+
+    operations = [
+        migrations.RenameField(
+            model_name="customer",
+            old_name="exempt_from_from_license_number_check",
+            new_name="exempt_from_license_number_check",
+        ),
+    ]

corporate/models.py

@@ -26,7 +26,7 @@ class Customer(models.Model):
     # only for their paid employees.  We don't prevent these
     # organizations from adding more users than the number of licenses
     # they purchased.
-    exempt_from_from_license_number_check = models.BooleanField(default=False)
+    exempt_from_license_number_check = models.BooleanField(default=False)
 
     def __str__(self) -> str:
         return f"{self.realm!r} {self.stripe_customer_id}"