Assertion bugfix for apply_deltas in Box2BoxTransformRotated
Assertion bugfix for apply_deltas in Box2BoxTransformRotated

Summary:
As of facebookresearch/detectron2@bf11a9b5bbc8e80cfe713c547203576a77a09065, deltas have shape `(N, k*5)` but assertion hasn't been updated to reflect this.
Pull Request resolved: https://github.com/facebookresearch/detectron2/pull/1501

Differential Revision: D21803555

Pulled By: ppwwyyxx

fbshipit-source-id: ef0cdf696365aec52c063448109f3b9700695996

facebookresearch/detectron2,facebookresearch/detectron2,facebookresearch/detectron2