fix the trailing whitespace from the image name

[mmahut]

Deployment of nginx-example on Red Hat Sandbox Openshift (4.20.14) was failing to admit pods with:

Pod "nginx-example-675cc5bc44-78dpt" is invalid:
spec.containers[0].image: Invalid value: " ": must not have leading or trailing whitespace

Looks like the image field in the deployment file contained a trailing whitespace, which Kubernetes rejects.