Fix unity path

[VioletXF]

Changes

Sorry, I was stupid. I tested my previous work(#551) on a cached environment and thought I'd done testing installation.

• Add quotes back to unity path
• Replace quotes on existsSync check

Sorry again to everyone for pushing the failing code

Checklist

• Read the contribution guide and accept the
  code of conduct
• Docs (If new inputs or outputs have been added or changes to behavior that should be documented. Please make
  a PR in the documentation repo)
• Readme (updated or not needed)
• Tests (added, updated or not needed)

[github-actions]

[codecov-commenter]

Codecov Report

Merging #552 (9bf64ad) into main (21da302) will not change coverage.
The diff coverage is n/a.

❗ Current head 9bf64ad differs from pull request most recent head 53c5312. Consider uploading reports for the commit 53c5312 to get more accurate results

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@@           Coverage Diff           @@
##             main     #552   +/-   ##
=======================================
  Coverage   36.97%   36.97%           
=======================================
  Files          77       77           
  Lines        3032     3032           
  Branches      586      586           
=======================================
  Hits         1121     1121           
  Misses       1908     1908           
  Partials        3        3           

[webbertakken]

No worries at all. Let's just focus on getting the fix in :)

Thanks a lot for your quick response!