"git log --decorate-refs-exclude=<pattern>" was incorrectly
overruled when the "--simplify-by-decoration" option is used, which
has been corrected.

* rs/simplify-by-deco-with-deco-refs-exclude:
  log-tree: call load_ref_decorations() in get_name_decoration()
  log: test --decorate-refs-exclude with --simplify-by-decoration