sw: fix not-quite-copypaste code in SwDocStyleSheet::FillStyleSheet()

This causes the temporary creation of frame styles to fail.

Change-Id: I5d148ae008660d9c0f457a4c0e9dc256e0dfc49a
(cherry picked from commit 110dc43d)
Reviewed-on: https://gerrit.libreoffice.org/18380Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Miklos Vajna <vmiklos@collabora.co.uk>

sw/source/uibase/app/docstyle.cxx

@@ -1779,7 +1779,7 @@ bool SwDocStyleSheet::FillStyleSheet( FillStyleType eFType )
     case SFX_STYLE_FAMILY_FRAME:
         pFrameFormat = lcl_FindFrameFormat(rDoc,  aName, this, bCreate);
         bPhysical = 0 != pFrameFormat;
-        if( bFillOnlyInfo && bPhysical )
+        if (bFillOnlyInfo && !bPhysical)
         {
             ::sw::UndoGuard const ug(rDoc.GetIDocumentUndoRedo());
             bDeleteInfo = true;