[Material] evaluate the number of columns correctly when rebuilding the FCMats (#5910)

* evaluate the number of columns correctly.
* simplify awk command

src/Mod/Material/StandardMaterial/Tools/make_FCMats.sh

@@ -26,7 +26,7 @@ function get_xy() {
 }
 
 # Determine number of columns and rows in the Materials.csv file
-NUMBER_OF_COLUMNS=$(cat $MATERIALS_FILE.csv | awk --field-separator="|" "NR==1 { print NF }")
+NUMBER_OF_COLUMNS=$(awk -F "|" "NR==1 { print NF }" $MATERIALS_FILE.csv )
 NUMBER_OF_ROWS=$(cat $MATERIALS_FILE.csv | wc -l)
 
 echo "Setting output directory:" $FCMAT_OUTPUT_DIR