[artifactory] Prevent erroneous redirects to port 8443

[TomyLobo]

• /artifactory/ is currently (mis)handled by nginx and redirects to port 8443
• Same with /artifactory, however, if I remove only the rewrite line, the request goes somewhere else (I think it's the router) and still redirects to port 8443.

This commit fixes both issues by letting Artifactory itself handle those redirects.

PR Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• [ ] Chart Version bumped
• [ ] CHANGELOG.md updated
• [x] Variables and other changes are documented in the README.md
• [x] Title of the PR starts with chart name (e.g. [artifactory])

What this PR does / why we need it:

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes # Case: 357670

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[chukka]

Thanks for the PR! We'll review this internally and have created an internal tracking issue for it.