Fix Variant Peptide ID

[zhuchcn]

Description

VariantPeptideIdentifier.parse_variant_peptide_id parses variant peptide IDs, but when it converts back to str, ORF ID was placed in the wrong position. For example, ENST0001|SNV-100-A-T|ORF1|1 becomes ENST0001|ORF1|SNV-100-A-T|1. This makes annotator confused.

Closes #...

Checklist

• This PR does NOT contain PHI or germline genetic data. A repo may need to be deleted if such data is uploaded. Disclosing PHI is a major problem.
• This PR does NOT contain molecular files, compressed files, output files such as images (e.g. .png, .jpeg), .pdf, .RData, .xlsx, .doc, .ppt, or other non-plain-text files. To automatically exclude such files using a .gitignore file, see here for example.
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• The name of the branch is meaningful and well formatted following the standards, using [AD_username (or 5 letters of AD if AD is too long)]-[brief_description_of_branch].
• I have added the major changes included in this pull request to the CHANGELOG.md under the next release version or unreleased, and updated the date.
• All test cases passed locally.