Bug 21784: Clean up js_includes.inc

Bug 21784: Clean up js_includes.inc

This patch cleans up js_includes.inc by removing script "type"
attributes which are now invalid HTML. The patch also removes "CDATA"
markers from script blocks. They have been unnecessary since we stopped
using an XHTML doctype.

To test, apply the patch and look at various pages in the staff client
to confirm that no JavaScript-driven interactions are broken.

Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>