Fix validation message when there is a parameter with escaped dot "\."

[mahbubhelal]

When there are parameters with an escaped dot in the validation rule, the error message is weird due to the dotPlaceholder not being replaced in the error message.

For example:

Validator::make([], ['name' => 'required_without:user\.name'])->validate();

Would produce an error message like "The name field is required when usery dh uny p t1 o ns i e rfname is not present."

This PR should fix that.