sw: fix copypasta assertions

Change-Id: Ic064a738f5f17e006cc5ada125a5143e7cf57d32
Reviewed-on: https://gerrit.libreoffice.org/54120Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
Reviewed-by: Michael Stahl <Michael.Stahl@cib.de>

sw/source/core/frmedt/feshview.cxx

@@ -402,7 +402,7 @@ bool SwFEShell::MoveAnchor( SwMove nDir )
             }
             case RndStdIds::FLY_AT_CHAR:
             {
-                OSL_ENSURE( pOld->IsContentFrame(), "Wrong anchor, page expected." );
+                OSL_ENSURE(pOld->IsTextFrame(), "Wrong anchor, text frame expected.");
                 if( SwMove::LEFT == nDir || SwMove::RIGHT == nDir )
                 {
                     SwPosition pos = *aAnch.GetContentAnchor();
@@ -437,7 +437,7 @@ bool SwFEShell::MoveAnchor( SwMove nDir )
             }
             case RndStdIds::FLY_AT_PARA:
             {
-                OSL_ENSURE( pOld->IsContentFrame(), "Wrong anchor, page expected." );
+                OSL_ENSURE(pOld->IsTextFrame(), "Wrong anchor, text frame expected.");
                 if( SwMove::UP == nDir )
                     pNew = pOld->FindPrev();
                 else if( SwMove::DOWN == nDir )