Copy both production and dev react to htdocs

[driusan]

The webpack config is incorrectly only copying one (production or dev) version of react to htdocs. This causes the login page to stop loading based on the sandbox flag, which may be trying to load one or the other.

The decision to copy or not in webpack is based on a NODE_ENV environment variable which is not used or documented anywhere in LORIS, and LORIS may dynamically choose one or the other based on the configuration variable which can be changed without recompiling.

Go back to copying both so that LORIS will load regardless of the sandbox flag.

This should fix #10425 (it was the only problem I had on a fresh install) but the issue is vague and claims there is another problem which I didn't experience.

Fixes #10400

[regisoc]

Test process:

• for each make dev or npm run compile/make or npm run build case:
  • remove all files in htdocs/vendor/js/react folder.
  • run the make dev/make/npm run compile/npm run build command.
  • check htdocs/vendor/js/react folder is populated with:
    • react.development.js
    • react-dom.development.js
    • react.production.min.js
    • react-dom.production.min.js.

All 4 files copied successfully for all 4 cases.