RFR: 1995: The logic for getting repository name and branch name in the backport pr command is inconsistent [v2]

[Zhao Song]

> In the backport pull request command, the process of getting the repository name and branch name differs between cancelling a backport request and creating a backport request. 
> 
> In this patch, I made the logic consistent.

Zhao Song has updated the pull request incrementally with one additional commit since the last revision:

  update

-------------

Changes:
  - all: https://git.openjdk.org/skara/pull/1545/files
  - new: https://git.openjdk.org/skara/pull/1545/files/deadb096..182fb51f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=skara&pr=1545&range=01
 - incr: https://webrevs.openjdk.org/?repo=skara&pr=1545&range=00-01

  Stats: 6 lines in 1 file changed: 2 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/skara/pull/1545.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1545/head:pull/1545

PR: https://git.openjdk.org/skara/pull/1545