Move o.e.e4.ui.css.core to Java 11 BREE due to org.w3c.dom.css package
not found when building using --release 8 compiler property.

Change-Id: I978a257b707d2a5eeaf81f0537607d671a3c6d43
Signed-off-by: Alexander Kurtakov <akurtako@redhat.com>