[FIX] ux3 facet filter example when switching a facet from one active
filter to another

Change-Id: I9e9047c7c85c5e5aa76c3a95c6569d38ac66533a
Fixes https://github.com/SAP/openui5/pull/213
Merge "[FIX] ux3 facet filter example when switching a facet from one active filter to another"