HPCC-9213 Remove unused css links

On Chrome, WsECL Query tree collapses after a user refreshes the
page. This fix removes two unused css links inside the WsECL xsl
file. After those links are removed, the Query tree does not
collapse any more.

Signed-off-by: Kevin Wang <kevin.wang@lexisnexis.com>
Merge pull request #4709 from wangkx/h9213

HPCC-9213 Remove unused css links

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>