remove protein_bound_construct field from test data.

WIP on #204

ippisite/ippidb/migrations/0051_remove_testactivitydescription_protein_bound_construct.py

+# Generated by Django 2.2.1 on 2020-04-23 08:16
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('ippidb', '0050_auto_20200420_2015'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='testactivitydescription',
+            name='protein_bound_construct',
+        ),
+    ]