Fix old py2 default value for action model

This just gets rid of the byte part from:
default=b'default'
which exists in the initial migration file

Change-Id: I99c1625f27c4cf75cb8dedce6fdb46e70bb9c2ef

adjutant/actions/migrations/0003_auto_20190610_0205.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.21 on 2019-06-10 02:05
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('actions', '0002_action_auto_approve'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='action',
+            name='state',
+            field=models.CharField(default='default', max_length=200),
+        ),
+    ]