Fix precompile error on the dialog_iequirks.css file

Hi,

A bug has reappeared with the CKEditor update and the release of the 4.0.3 version.

So, I have set the old value of the 4.0.2 version.

Maybe, it's necessary to pull request this value on the CKEditor repository?

The error message:

    Sass::SyntaxError: Invalid CSS after "..._footer{filter:": expected expression (e.g. 1px, bold), was "}"

Best Regards.