[TECH. SUPPORT] LPS-32823

Hi Tamás,

As you can see on the JIRA ticket, the paginator component has been used incorrectly in the private messaging portlet. 

This pull request contains fixes for two minor issues.

Please ignore those commits which belong to LPS-32302 and review them separately (https://github.com/moltam89/liferay-plugins/pull/3). Nevertheless LPS-32823 depends on that fix, so they are necessary in terms of testing.

Cheers,
Laci.