Bug 26959: Reindent batch item modification template

Bug 26959: Reindent batch item modification template

This patch reindents the batch item modification template to make
indentation consistent. Some lines have been split up.

Some markup issues have been corrected: Removed script "type" attribute,
removed obsolete "CDATA" markers, removed obsolete IE-specific
conditional comment.

To test, apply the patch and go to Tools -> Batch item
modification.

- Test the process of submitting a barcode file, and item number file,
  and a list of barcodes.
- Confirm that everything works as expected.

Use your preferred method for checking the differences between files
while ignoring whitespace. I use diff with the  "-w" flag, but I've been
known to leave my car keys in the refrigerator from time to time. The
only changes you see should be split lines.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>