Fix ParaViewWeb install rules

The www was missing lately from the install tree.
This commit ensure that it get properly added inside
the install tree as well as inside the Apple bundle.

Change-Id: I9543ec27be78fedd1963cc63142d42b024d87c6e
Merge topic 'pvw-fix-www-install-rules' into next

5f8f86d Fix ParaViewWeb install rules