When using "rbt patch" to apply a change from a review request that was created with history, it uses the commit message as the message for the new commit that it's creating. This is ideal when applying a review request that has multiple commits (since it pulls in all of the messages for each commit in turn), but it didn't feel right for the simpler case of applying a change with a single commit. In order to maintain the same behavior as before, we now use the review request details as the commit message when there's only one commit. Testing Done: Verified that after this change, `rbt patch -c` used the review request details as the commit message instead of the commit metadata.