Fix manual remediation for SPO rule

We have a manual remediation for installing SPO, but it was failing
in our e2e suite with the following error:

  fork/exec /go/src/github.com/ComplianceAsCode/content/applications/openshift/confinement/security_profiles_operator_exists/tests/ocp4/e2e-remediation.sh: permission denied

This commit updates the script so that it's executable and doesn't fail
when applied.