Remove closure compile hack when running npm ci

[sbc100]

See https://chromium.googlesource.com/emscripten-releases/+/2ee2f60605a7774b4e194c235e372c29973038ab

[juj]

I was verifying this change locally, since this PR results in Java closure compiler no longer being deleted, but it looks like there is an earlier regression with the addition of the bootstrap.py script in Emscripten that masked the size diff.

Before bootstrap.py script, the node_modules\ subdirectory on Windows would read 81.0 MB (85,015,488 bytes) in size.

After addition of bootstrap.py, the subdirectory reads 169 MB (177,525,552 bytes), a 2x increase.

I wrote more details at #1546.