[TECHNICAL SUPPORT] LPS-32188

Hi Mate,

While I was trying to fix LPS-32187, I stumbled upon some regression bugs in Private Messaging Portlet. In order to be able to fix the original XSS issue, I had to deal with them first.

* Deploying Private Messaging Portlet ends up in JSP compilation error caused by https://github.com/laszlocsontos/liferay-portal/commit/a94e0d1fa0a19c3a233dde50d9ff49156468dbf2.

* LiferayWindowState.EXCLUSIVE used instead of WindowState.NORMAL in new_message.jsp caused by https://github.com/laszlocsontos/liferay-plugins/commit/3fbab19.

Thanks for reviewing.

Cheers,
Laci.

PS: Pull request for LPS-32187 is coming soon.