(bug): Unable to pull bundles with latest tag

[schristoff]

Describe the bug

When pulling a bundle with :latest at the end, an additional : gets added

To Reproduce

porter install --force porter-hello --reference ghcr.io/getporter/examples/porter-hello:latest
unable to pull bundle: ghcr.io/getporter/examples/porter-hello:latest: not found
unable to pull bundle: ghcr.io/getporter/examples/porter-hello:latest: not found

Expected behavior

Bundle properly gets downloaded

I'm assuming it is something within the resolveBundleReference function, and perhaps (since this was most recently touched) ensureVPrefix func.