SFX2 : Remove usage of DBG_CTOR and DBG_DTOR.

Valgrind is capable of detecting such bugs. No need for extra macros.

Change-Id: I35a9403da152ea2b637c0235d776c7789e2ef207
Reviewed-on: https://gerrit.libreoffice.org/8420
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>