DEDENT_CLOSING_BRACKETS has odd split behaviour if arguments fit in line, but expression does not

Might be similar behaviour issues to #349, but regardless, the following snippet:
```python
record['data'] = {
data['data_key']: data['data_value']
for data in self.get_resource(
'service_instance_data',
svc_id=record['svc_id']
)
}
```

When formatting based on PEP8 style, the arguments are condensed to a single line:
```python
record['data'] = {
data['data_key']: data['data_value']
for data in self.get_resource(
'service_instance_data', svc_id=record['svc_id'])
}
```
When applying `DEDENT_CLOSING_BRACKETS`, I would expect the original code to pass (due to argument line split, but instead it splits after `self`, trying to fit the expression:
```python
record['data'] = {
data['data_key']: data['data_value']
for data in self.
get_resource('service_instance_data', svc_id=record['svc_id'])
}
```

This happens regardless of the PEP8 or original code being submitted for formatting.