cmd/mr_edit: update Draft detection to use hasPrefix()
cmd/mr_edit: update Draft detection to use hasPrefix()

hasPrefix() should be used here, to avoid re-calling the same proceedures
multiple times.

Signed-off-by: Bruno Meneguele <82c7731bc2625bcbab88bc571aee6631ba3f66f3@redhat.com>

zaquestion/lab,zaquestion/lab