Remove legacy scripts from .jshintignore

- skins/common/config.js only needed a singlequote fix to pass JSHint.
- skins/common/IEFixes.js passes thanks to I1ee94b184.

Change-Id: If23ff6e13ea1e0060e7366346196ee61c4cbb841
Merge "Remove legacy scripts from .jshintignore"