Related tdf#40713, use DecodeMechanism::Unambiguous

Change-Id: I73221fb6c127903398a7faae48d5247339ec8d7f
Reviewed-on: https://gerrit.libreoffice.org/39214Reviewed-by: Lionel Elie Mamane <lionel@mamane.lu>
Tested-by: Jenkins <ci@libreoffice.org>

sc/source/ui/docshell/docsh.cxx

@@ -2382,7 +2382,7 @@ bool ScDocShell::ConvertTo( SfxMedium &rMed )
 
                 // tdf#40713: don't lose dbt file
                 // if aDbtFile corresponds exactly to aTmpFile, we just have to return
-                if (aDbtFile.GetMainURL( INetURLObject::DecodeMechanism::NONE ) == aTmpFile.GetMainURL( INetURLObject::DecodeMechanism::NONE ))
+                if (aDbtFile.GetMainURL( INetURLObject::DecodeMechanism::Unambiguous ) == aTmpFile.GetMainURL( INetURLObject::DecodeMechanism::Unambiguous ))
                     return bRet;
 
                 if ( IsDocument( aDbtFile ) && !KillFile( aDbtFile ) )