Updated credit migration for CreditProvider.provider_id

There is no need for a separate migration for the validation. Updated the regex in the initial migration to appease Django.

ECOM-2609

openedx/core/djangoapps/credit/migrations/0001_initial.py

@@ -47,7 +47,7 @@ class Migration(migrations.Migration):
                 ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
                 ('created', model_utils.fields.AutoCreatedField(default=django.utils.timezone.now, verbose_name='created', editable=False)),
                 ('modified', model_utils.fields.AutoLastModifiedField(default=django.utils.timezone.now, verbose_name='modified', editable=False)),
-                ('provider_id', models.CharField(help_text='Unique identifier for this credit provider. Only alphanumeric characters and hyphens (-) are allowed. The identifier is case-sensitive.', unique=True, max_length=255, validators=[django.core.validators.RegexValidator(regex=b'^[a-z,A-Z,0-9,\\-]+$', message=b'Only alphanumeric characters and hyphens (-) are allowed', code=b'invalid_provider_id')])),
+                ('provider_id', models.CharField(help_text='Unique identifier for this credit provider. Only alphanumeric characters and hyphens (-) are allowed. The identifier is case-sensitive.', unique=True, max_length=255, validators=[django.core.validators.RegexValidator(regex=b'[a-z,A-Z,0-9,\\-]+', message=b'Only alphanumeric characters and hyphens (-) are allowed', code=b'invalid_provider_id')])),
                 ('active', models.BooleanField(default=True, help_text='Whether the credit provider is currently enabled.')),
                 ('display_name', models.CharField(help_text='Name of the credit provider displayed to users', max_length=255)),
                 ('enable_integration', models.BooleanField(default=False, help_text='When true, automatically notify the credit provider when a user requests credit. In order for this to work, a shared secret key MUST be configured for the credit provider in secure auth settings.')),