Remove TReportPairHelper and TStartMarkerHelper as well since they
were helper structs that were used solely for many of these
o3tl::compose calls and are now unused.

Change-Id: I75b366a7951a841c49a34709a3bdc1877952b64d
Reviewed-on: https://gerrit.libreoffice.org/16606Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Stahl <mstahl@redhat.com>