SOAP: remove useless script block from XSLT

The js file referenced in the XSLT is missing from the distribution,
which causes errors in the apache error logs:
File does not exist: /path/to/mantisbt/api/soap/wsdl-viewer.js

As per the XSLT's author,

On 23 January 2015 at 18:03, Tomi Vanek tomi.vanek@gmail.com wrote:

JS - that was just a plan that was never finished - browsers block JS
from file system, so I did not go in that direction, just forgot the
link in generated code - this is a harmless bug

This commit resolves the issue by removing the <script> block from the
XSLT file.

Fixes 0018049