Fix the comment required feature

[coudot]

The "required" parameter was not correctly set:

{if $use_lockcomment_required || $use_unlockcomment_required}required{/if}

This means that if only one of the two options is true, the required field is set.

The required field should be set only if the matching option is true.

@abpai94 feel free to contact me if this is not clear for you.