[FLINK-17264][scripts] Fix broken taskmanager.sh by using -ne to comp…

…are num_lines

This closes apache#11820.

flink-dist/src/main/flink-bin/bin/config.sh

@@ -646,7 +646,7 @@ extractExecutionParams() {
  local EXECUTION_PREFIX="BASH_JAVA_UTILS_EXEC_RESULT:"
 
  local num_lines=$(echo "$execution_config" | wc -l)
- if ! [[ ${num_lines} == 1 ]]; then
+ if [[ ${num_lines} -ne 1 ]]; then
  echo "[ERROR] Unexpected result ($num_lines lines): $execution_config" 1>&2
  echo "[ERROR] extractExecutionParams only accepts exactly one line as the input" 1>&2
  exit 1