rc python: Highlight indented decorators with `.`

Make sure decorators are on their own line, and don't stop highlighting at
the first dot when they are imported, e.g.

```
import enum

@enum.unique
class A(enum.Enum):
    …
```

Ideally highlighting shouldn't stop at the first parenthesis either
(e.g. `@foo(['1'])`), but the current code somewhat highlights the contents
of the parens already, which is good enough in most cases.

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