When using rbt land to apply a remote change from a review request, we

weren't respecting the --edit flag, which meant that if a user wanted to

reformat the commit message (for example, wrapping to 80 columns), they'd have

to amend the commit later. I've added a check in the patch method to use

either -C or -c as appropriate.

Used rbt land -r XXXX -e --dest master and saw that it invoked my editor.