Update CODEOWNERS
Update path to c++ library as it was renamed to libopaecxx
# API specification, implementation, and samples
/common/include/OPAE/ @OPAE/api
/libopae/ @OPAE/api
-/libopae++/ @OPAE/api
+/libopaecxx/ @OPAE/api
/samples/ @OPAE/api
# Tools
