When creating a new price break for a supplier part, default to using the currency code specified for the supplier company

InvenTree/part/migrations/0059_auto_20201112_1112.py

@@ -0,0 +1,20 @@
+# Generated by Django 3.0.7 on 2020-11-12 00:12
+
+import InvenTree.fields
+import django.core.validators
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('part', '0058_remove_partsellpricebreak_cost'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='partsellpricebreak',
+            name='quantity',
+            field=InvenTree.fields.RoundingDecimalField(decimal_places=5, default=1, help_text='Price break quantity', max_digits=15, validators=[django.core.validators.MinValueValidator(1)], verbose_name='Quantity'),
+        ),
+    ]