HPCC-10442 Fix redering of embeded view resources when using libxslt

This is not a regression.  It may only affect resources with certain
type of original path... i.e. directories with spaces in the names.

Libxslt was double url encoding the path before passing it to the
registered include handler callback.

Signed-off-by: Anthony Fishbeck <anthony.fishbeck@lexisnexis.com>