[BUG] openapi-generator-cli detects wrong version

Created by: kokorin

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used?
• Have you search for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Bounty to sponsor the fix (example)

Description

openapi-generator-cli.sh detects version as v3.3.4 not 3.3.4

openapi-generator version

3.3.4

Steps to reproduce

Download launch script and run it

Suggest a fix

if [[ $ver == v* ]]
then
ver=${ver:1}
fi```