Reorder Javascript in layoutedit.pt to common sense order hoping ...

...to avoid the following occasional Javascript Error:

    TypeError: jss is not a function
    width: '98%'
     at line 313 of layout_edit.js 

which ends up with Layouts displaying in one line. So, the standard 'Layout A' looking like this:

![collective cover_1 0a9](https://cloud.githubusercontent.com/assets/1470021/3661859/bd9d8bf8-11c4-11e4-82b6-373651959fc2.png)

Note this seems to occur just after upgrade - leading me to suspect the problem goes away once jss.min.js is cached.  Nonetheless this seems a sensible little change that shouldn't cause problems.

See https://community.plone.org/t/new-release-of-collective-cover/187/4 for a bit more discussion