port --col-width from `helm list` to `helm search

[bacongobbler]

Looks like the column width in helm search is hardcoded at 50 characters: https://github.com/kubernetes/helm/blob/6e413a6a57d631f8d0e54bcec4a0f0f89289cbe4/cmd/helm/search.go#L134

Someone on Slack mentioned this would be useful so they can see the full output.