Return price breaks in the correct order

InvenTree/part/migrations/0030_auto_20190518_1641.py

@@ -0,0 +1,19 @@
+# Generated by Django 2.2 on 2019-05-18 06:41
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('part', '0029_auto_20190518_1632'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='supplierpricebreak',
+            name='part',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='pricebreaks', to='part.SupplierPart'),
+        ),
+    ]