mq: drop copy records when refreshing regular patches (issue1441) Copy information was saved in a common loop, then refined in a git-only block. The problem was the latter did filter out renames occuring in the current patch and irrelevant to commit. In the non-git case, copy records still existed in the dirstate, referencing removed files, making the commit to fail. Git and non-git copy handling paths are now separated for simplicity. Reported by Gary Bernhardt