Related tdf#83877 Add signatureline element to draw:frame, not draw:image

Because a frame can have multiple (fallback) images, so this would have been
added only to the first one.

Change-Id: I1c41c5e6fd3959fb5cfb5afb5d4fe98b2e5e3c73
Reviewed-on: https://gerrit.libreoffice.org/46243Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>

xmloff/source/draw/shapeexport.cxx

@@ -2410,8 +2410,8 @@ void XMLShapeExport::ImpExportGraphicObjectShape(
             if (!aMimeType.isEmpty())
                 GetExport().AddAttribute(XML_NAMESPACE_LO_EXT, "mime-type", aMimeType);
 
-            SvXMLElementExport aOBJ(mrExport, XML_NAMESPACE_DRAW, XML_IMAGE, true, true);
             ImpExportSignatureLine( xShape );
+            SvXMLElementExport aOBJ(mrExport, XML_NAMESPACE_DRAW, XML_IMAGE, true, true);
 
             if( !sImageURL.isEmpty() )
             {