Fix typo in _helpers.tpl/renderImage

[Stevenpc3]

What this PR does

Fix typo in _helpers.tpl/renderImage

Which issue this PR fixes

using globalRegistry does not work properly

(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged)

• fixes #

Checklist

• [ ] DCO signed
• [ ] Commits are GPG signed
• [ ] Chart Version bumped
• [ ] Title of the PR starts with chart name ([jaeger] or [jaeger-operator])
• [ ] README.md has been updated to match version/contain new values

[pavelnikolov]

@Stevenpc3 thanks for your PR. Could you, please, address the PR requirements?

[Stevenpc3]

I closed this PR because I was using the web code features and didn't have it set to sign the commits.