1. Correct code indentations based on jQuery Style Guide
(contribute.jquery.org/style-guide/js/#spacing).
2. Add rules to "src/.eslintrc.json" to enable "enforcing consistent
indentation", with minimal changes to the current code.
Closes gh-4672
(cherry picked from 3d62d57049)
The new regex from after the switch from JSHint to ESLint wasn't catching
the ESLint pragma correctly.
Also, the spacing of the pragma comment was updated to match other comments.
