Fix conditional exports again for ESM

[lukastaegert]

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:

Description

The previous fix apparently broke the ESM import due to an ordering issue, so here we go again...

[rollup-bot]

Thank you for your contribution! ❤️

You can try out this pull request locally by installing Rollup via

npm install rollup/rollup#fix-conditional-exports-again

or load it into the REPL:
https://rollupjs.org/repl/?circleci=9816

[codecov]

Codecov Report

Merging #3430 into master will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3430   +/-   ##
=======================================
  Coverage   95.00%   95.00%           
=======================================
  Files         171      171           
  Lines        5831     5831           
  Branches     1722     1722           
=======================================
  Hits         5540     5540           
  Misses        157      157           
  Partials      134      134           

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