changed test/data for select to GRIB format

test/data/gen_refdata.sh

@@ -78,9 +78,9 @@ OFILE=pl_data.grb
 $CDO -ml2pl,90000,9000,900,90 -remapbil,global_30 -sp2gp -seltimestep,1/5 -dayavg -selcode,129,130,152 $IFILE $OFILE
 IFILE=$OFILE
 OFILE=select1_ref
-$CDO $FORMAT select,code=130,152 $IFILE $OFILE
+$CDO select,code=130,152 $IFILE $OFILE
 OFILE=select2_ref
-$CDO $FORMAT select,code=130,152,level=9000,90 $IFILE $OFILE
+$CDO select,code=130,152,level=9000,90 $IFILE $OFILE
 OFILE=select3_ref
-$CDO $FORMAT select,code=130,152,level=9000,90,timestep=2,3,5 $IFILE $OFILE
+$CDO select,code=130,152,level=9000,90,timestep=2,3,5 $IFILE $OFILE
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