Fix JS issue with dashboard assets

Two issues:

1. Due to a missing semicolon in the mousewheel lib, the JS would raise a
   syntax error when minified by django-compressor.  Fixed by adding a
   semicolon.

2. The minified wysihtml5 library can't be minified as it leads to a
   syntax error.  Fixed by linking to the unminified version instead.
Fix broken functional tests!

I forgot to modify the test config to account for django-compressor.
Correct template logic for whether to use LESS

Should enable CSS on the sandbox again.