fix: path to rollup binary

[alan-agius4]

FIxes: #3029

[styfle]

I don't think this won't work. The file needs to start with #!/usr/bin/env node.

Also compare the two files:

https://unpkg.com/browse/rollup@1.18.0/bin/rollup

https://unpkg.com/browse/rollup@1.19.0/dist/rollup.js

[codecov]

Codecov Report

Merging #3030 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3030   +/-   ##
=======================================
  Coverage   88.65%   88.65%           
=======================================
  Files         165      165           
  Lines        5694     5694           
  Branches     1738     1738           
=======================================
  Hits         5048     5048           
  Misses        388      388           
  Partials      258      258

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[lukastaegert]

Thanks, but this is not the correct file, see
#3031