rm leading semicolon in variant_ids

[rjcorb]

Purpose/implementation Section

What feature is being added or bug is being addressed?

Closes #238. Simple fix to remove semicolons at the start of variant_ids column values (will occur in instances where no value in raid)

What was your approach?

What GitHub issue does your pull request address?

Directions for reviewers. Tell potential reviewers what kind of feedback you are soliciting.

Which areas should receive a particularly close look?

Is there anything that you want to discuss further?

Documentation Checklist

• [ ] The function has examples to showcase the usage
• [ ] Added a vignette