Fix flake8 E251 unexpected spaces around keyword / parameter equals

Fixed automatically with autopep8:

  git ls-files | grep py$ | xargs autopep8 --in-place --select E251

Change-Id: I58009e1c8c91c39745d559ac919be331d4cd9e77
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/254598
Tested-by: David Pursehouse <dpursehouse@collab.net>
Reviewed-by: Mike Frysinger <vapier@google.com>
diff --git a/subcmds/manifest.py b/subcmds/manifest.py
index 9c1b3f0..6bb0104 100644
--- a/subcmds/manifest.py
+++ b/subcmds/manifest.py
@@ -66,8 +66,8 @@
     else:
       fd = open(opt.output_file, 'w')
     self.manifest.Save(fd,
-                       peg_rev = opt.peg_rev,
-                       peg_rev_upstream = opt.peg_rev_upstream)
+                       peg_rev=opt.peg_rev,
+                       peg_rev_upstream=opt.peg_rev_upstream)
     fd.close()
     if opt.output_file != '-':
       print('Saved manifest to %s' % opt.output_file, file=sys.stderr)