Fix indentation issues reported by flake8

- E121 continuation line under-indented for hanging indent
- E122 continuation line missing indentation or outdented
- E125 continuation line with same indent as next logical line
- E126 continuation line over-indented for hanging indent
- E127 continuation line over-indented for visual indent
- E128 continuation line under-indented for visual indent
- E129 visually indented line with same indent as next logical line
- E131 continuation line unaligned for hanging indent

Fixed automatically with autopep8:

  git ls-files | grep py$ | xargs autopep8 --in-place \
    --select E121,E122,E125,E126,E127,E128,E129,E131

Change-Id: Ifd95fb8e6a1a4d6e9de187b5787d64a6326dd249
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/254605
Reviewed-by: Mike Frysinger <vapier@google.com>
Tested-by: David Pursehouse <dpursehouse@collab.net>
diff --git a/subcmds/start.py b/subcmds/start.py
index 9b81086..f98f790 100644
--- a/subcmds/start.py
+++ b/subcmds/start.py
@@ -113,7 +113,7 @@
           branch_merge = self.manifest.default.revisionExpr
 
       if not project.StartBranch(
-          nb, branch_merge=branch_merge, revision=opt.revision):
+              nb, branch_merge=branch_merge, revision=opt.revision):
         err.append(project)
     pm.end()