fix: prune electron-nightly even if in dependencies

[erickzhao]

• I have read the contribution documentation for this project.
• I agree to follow the code of conduct that this project follows, as appropriate.
• The changes are appropriately documented (if applicable).
• The changes have sufficient test coverage (if applicable).
• The testsuite passes successfully on my local machine (if applicable).

Summarize your changes:

If electron-nightly is installed in dependencies by accident, we want to prune it.

[codecov]

Codecov Report

Merging #1538 (7f4c194) into main (5ee6d73) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1538   +/-   ##
=======================================
  Coverage   95.58%   95.58%           
=======================================
  Files          15       15           
  Lines         793      793           
=======================================
  Hits          758      758           
  Misses         35       35           

Files Changed	Coverage Δ
src/prune.js	100.00% <ø> (ø)

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more