Fixes return type of `ConfigureCommand::pathValidator`
Fixes return type of `ConfigureCommand::pathValidator`

`$path` is a string, not a boolean.

phpro/grumphp,tombevers/grumphp,janvernieuwe/grumphp,Big-Shark/grumphp,veewee/grumphp,janvernieuwe/grumphp,veewee/grumphp,Big-Shark/grumphp,phpro/grumphp,tombevers/grumphp