[graph] fix the contour program

We had incorrect number of POINTS passed (was 1, should be 2) and so
nodes circles weren't rendered properly.
Status Job ID Name Coverage
  Test
failed #5509
deps

failed #5510
test

 
Name Stage Failure
failed
test Test There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job trace
failed
deps Test There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job trace