Remove useless block in unzip method

What does this MR do and why?

Remove unnecessary, antiquated codeblock from unzip method that was causing errors when single files were zipped up/unzipped.

Resolves #191 (closed)

Testing Checklist

• Unzip file in server dir
• Zip upload import for java
• Zip upload import for bedrock
• Zip import for java
• Zip import for bedrock

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• Have you checked this doesn't interfere/conflict/duplicate someone elses work?
• Have you fully tested your changes?
• Have you resolved any lint issues?
• Have you assigned a reviewer?
• Have you applied correct labels?