[Files.app] Fix the list of included scripts in main.html

This should be matched with main_script.js. 

BUG=none
TEST=manually tested

Review URL: https://codereview.chromium.org/96813002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238129 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238129