Fix an invalid line of scss that breaks on upgrade

Original commit title:
"hide course menu hamburger in breadcrumb on personal files page”
    

This was invalid sass syntax and will break if we
upgrade node-sass    

Original test plan:
- as a user with the new ui
- navigate to "account" from the left-had nav
- click the "files" link (the page should now hide the course
  menu hamburger icon in the breadcrumb)

  note:
  - the breadcrumb alignment was also corrected in this commit

    old view: http://screencast.com/t/0pNNuheOl8hP
    new view: http://screencast.com/t/jmor0IBA

- lastly, ensure this change did not affect the hambuerger menu
  on any other pages

Change-Id: I14376de6104b88b14621029516bb233fdd6d47db
Reviewed-on: https://gerrit.instructure.com/104015
Tested-by: Jenkins
Reviewed-by: Pam Hiett <phiett@instructure.com>
Product-Review: Ryan Shaw <ryan@instructure.com>
QA-Review: Ryan Shaw <ryan@instructure.com>

Author: ryankshaw

app/stylesheets/pages/react_files/_react_files.scss

@@ -24,7 +24,7 @@ body.files {
 }
 
 // hides the course menu hamburger in the personal files breadcrumb
-body:not(.with-left-side) & .ic-app-nav-toggle-and-crumbs--files {
+body:not(.with-left-side) .ic-app-nav-toggle-and-crumbs--files {
   > .ic-app-course-nav-toggle {
     display: none;
   }