sw: fix indentation in rtfexport

Change-Id: I8fd5b1580584fdc824e3ea39d91d5b81b27856c6
unused DocxSdrExport::get/setFlyFrameGraphic

Change-Id: If8b541e3493ca221bf3c2f75f12f0856a3b372f6
coverity#704861 Unchecked dynamic_cast

Change-Id: I240c461efcf21d0f41ca7d7b2fb8d18cac71ab3b