Fix typo in function name when called

[dbarbuzzi]

Summary:

Fixes a bug in actions/testmo-run-submit-thread/action.yml where the step_status function defined was being called by the wrong name later.

Test Plan:

Related logic tested independently with an action that runs the problem area using Bash script:

step_status() {
  # echo "green encased checkmark" if "${1} == 0"
  # echo "red X"                   if "${1} != 0"

  if [ "$1" -eq 0 ]; then
    # green check
    echo -e "\xE2\x9C\x85"
  else
    # red x
    echo -e "\xE2\x9D\x8C"
  fi
}

step_status 0
step_status 1
step_status -12

Output:

✅
❌
❌