Update compiler/ztests/par-count.yaml

Co-authored-by: Noah Treuhaft <[email protected]>

Author: mattnibs

compiler/ztests/par-count.yaml

@@ -1,9 +1,7 @@
 # Test ensures that flowgraphs utilizing the count operator
 # are not parallelized.
 script: |
-  export SUPER_VAM=1
-  super -f csup -o a.csup -c 'values {x:1}'
-  super compile -C -P 2 'from a.csup | count {row_number,...this} | aggregate sum(x)'
+  SUPER_VAM=1 super compile -C -P 2 'from /dev/null | count {row_number,...this} | aggregate sum(x)'
 
 outputs:
   - name: stdout