[Rev 04] RFR: Fix parsing of editor commandline in git-pr

[Christoph Langer]

> For git editor configurations that aren't a simple call to an editor but have more parameters, the starting of the editor in git pr does not work.
> At least, I observed this in my windows environment, where I have the following git config entry:
> core.editor="C:\\Program Files\\Notepad++\\notepad++.exe" -multiInst -notabbar -nosession -noPlugin

The pull request has been updated with a new target base due to a merge or a rebase.

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Commits:
 - fcfba396: Fix parsing of editor commandline in git-pr.

Changes: https://git.openjdk.java.net/skara/pull/259/files
 Webrev: https://webrevs.openjdk.java.net/skara/259/webrev.04
  Stats: 22 lines in 1 file changed: 11 ins; 9 del; 2 mod
  Patch: https://git.openjdk.java.net/skara/pull/259.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/259/head:pull/259

PR: https://git.openjdk.java.net/skara/pull/259