Fix up code formatting

Also, an important note about previous patch fb6b7426:

The lambda inside QtConcurrent::run is NOT a coroutine. It is a regular lambda which can safely accept captures. The result of run() call is a QFuture which an enclosing coroutine awaits for, and it has nothing to do with how coroutine captures are destroyed at their first suspension. So, whatever bug it was attempting to fix, it should have not changed anything in the end; just a slightly more verbose way of writing the same thing.