Fix memory leak for BASIC sub (as well as void function)

d88593af59d9126cdbcd6c0a5b06fb9c673dc6f9 "INTEGRATION: CWS ab34: #i73457#
Prevent sub from beeing set as param 0 for return type void" to fix i#73457
"Memory Leak in all Basic type void Method calls" had made the PutDirect call
dependent on != SbxVOID only (which would cover void functions) but not also on
!= SbxEMPTY (which would apparently be required to also cover subs, as seen with
CppunitTest_basic_vba run under lsan).  Either this was an oversight with the
original fix, or subs have meanwhile changed from GetType() == SbxVOID to
SbxEMPTY?

Change-Id: I3e5dbf79bfd5eea3cfec8ed3fa984d13167aa501