Revert native UUID changes

Native UUID requires more work to be more stable,
reverting until the required changes are made.

For example, the last migrations in the list below results in the following incorrect SQL:

ALTER TABLE [ProcessTask] ADD DEFAULT 8017c963-68eb-4bde-babd-27fbd7240fc2 FOR [attempt]

operations = [
    migrations.CreateModel(
        name='UUIDModel',
        fields=[
            ('id', models.UUIDField(default=uuid.uuid4, editable=False, primary_key=True, serialize=False)),
            ('other',  models.UUIDField(null=True)),
        ],
    ),
    migrations.AlterField(
        model_name='uuidmodel',
        name='other',
        field=models.UUIDField(default=uuid.uuid4),
    ),
]

setup.py

@@ -17,7 +17,7 @@
 
 setup(
     name='django-mssql-backend',
-    version='2.4.1',
+    version='2.4.2',
     description='Django backend for Microsoft SQL Server',
     long_description=open('README.rst').read(),
     author='ES Solutions AB',

sql_server/pyodbc/base.py

@@ -97,7 +97,7 @@ class DatabaseWrapper(BaseDatabaseWrapper):
         'SmallIntegerField': 'smallint',
         'TextField': 'nvarchar(max)',
         'TimeField': 'time',
-        'UUIDField': 'char(36)',
+        'UUIDField': 'char(32)',
     }
     data_type_check_constraints = {
         'PositiveIntegerField': '[%(column)s] >= 0',

sql_server/pyodbc/features.py

@@ -3,7 +3,7 @@
 
 
 class DatabaseFeatures(BaseDatabaseFeatures):
-    has_native_uuid_field = True
+    has_native_uuid_field = False
     allow_sliced_subqueries_with_in = False
     can_introspect_autofield = True
     can_introspect_small_integer_field = True