Align Flags in Help Output with Actually Processed Flags

Within the help output of the `start-zars-and-num-node.sh` script the following flag is described: `--disable-result-obfuscation`.
However, this is not the flag which is actually processed. The flag that's processed is `--disable-obfuscation`.

Since this will inevitably lead to wrong usage with unexpected outcome for the user, these flags should get aligned.