fix: don't pass external modules to the manualChunks function

[TrickyPi]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:

resolves #5067

Description

I changed some code in PR #5050, so it causes that external modules are passed to the manualChunks function. This PR reverts it back.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
rollup	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 15, 2023 6:15pm

[codecov]

Codecov Report

Merging #5068 (0cc989c) into master (fecf0cf) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #5068      +/-   ##
==========================================
- Coverage   98.97%   98.97%   -0.01%     
==========================================
  Files         226      226              
  Lines        8357     8356       -1     
  Branches     2293     2293              
==========================================
- Hits         8271     8270       -1     
  Misses         31       31              
  Partials       55       55              

Impacted Files	Coverage Δ
src/Bundle.ts	100.00% <100.00%> (ø)

[lukastaegert]

Thanks a lot!

[rollup-bot]

This PR has been released as part of rollup@3.26.3. You can test it via npm install rollup.