Flask-Dynamo configuration fixes

config1.py

app.config['DYNAMO_TABLES'] = [
    dict(
         TableName='users',
         KeySchema=[dict(AttributeName='username', KeyType='HASH')],
         AttributeDefinitions=[dict(AttributeName='username', AttributeType='S')],
         ProvisionedThroughput=dict(ReadCapacityUnits=5, WriteCapacityUnits=5)
    ), dict(
         TableName='groups',
         KeySchema=[dict(AttributeName='name', KeyType='HASH')],
         AttributeDefinitions=[dict(AttributeName='name', AttributeType='S')],
         ProvisionedThroughput=dict(ReadCapacityUnits=5, WriteCapacityUnits=5)
    )
 ]

config2.py

app.config['DYNAMO_TABLES'] = [
    {
         'TableName': 'users',
         'KeySchema': [dict(AttributeName='username', KeyType='HASH')],
         'AttributeDefinitions': [dict(AttributeName='username', AttributeType='S')],
         'ProvisionedThroughput': dict(ReadCapacityUnits=5, WriteCapacityUnits=5)
    }, {
         'TableName': 'groups',
         'KeySchema': [dict(AttributeName='name', KeyType='HASH')],
         'AttributeDefinitions': [dict(AttributeName='name', AttributeType='S')],
         'ProvisionedThroughput': dict(ReadCapacityUnits=5, WriteCapacityUnits=5)
    }
 ]