give fasta file aboslute path in the error message

src/core/tandem_run/tandembatchprocess.cpp

@@ -96,7 +96,7 @@ TandemBatchProcess::writeXmlDatabaseFile(QXmlStreamWriter *p_out)
             QObject::tr(
               "error : Fasta file %1 is not writable.\n\"tandem.exe\" requires "
               "write permission on fasta files to run correctly.")
-              .arg(_tmp_database_file.fileName()));
+              .arg(QFileInfo(fasta_file).absoluteFilePath()));
         }
       p_out->writeStartElement("file");
       p_out->writeAttribute("format", "peptide");