Remove restriction on approval when cherry-picking (#1936)

This will allow us to create a PR while cherry-picking even when the
original PR wasn't approved because sometimes PR's get merged to the
master without approvals (for example,
https://github.com/bazelbuild/bazel/issues/21784). But it will still
check if the cherry-picking commit was made by "copybara", which is good
enough.
1 file changed