Fixed status migration (#159)

cvat/apps/engine/migrations/0012_auto_20181025_1618.py

@@ -1,5 +1,6 @@
-# Generated by Django 2.0.9 on 2018-10-24 15:17
+# Generated by Django 2.0.9 on 2018-10-25 13:18
 
+import cvat.apps.engine.models
 from django.db import migrations, models
 
 
@@ -13,11 +14,11 @@ class Migration(migrations.Migration):
         migrations.AddField(
             model_name='job',
             name='status',
-            field=models.CharField(default='annotation', max_length=32),
+            field=models.CharField(default=cvat.apps.engine.models.StatusChoice('annotation'), max_length=32),
         ),
         migrations.AlterField(
             model_name='task',
             name='status',
-            field=models.CharField(default='annotation', max_length=32),
+            field=models.CharField(default=cvat.apps.engine.models.StatusChoice('annotation'), max_length=32),
         ),
     ]