Remove not used paths field from PropertiesLauncher

[filiphr]

I've been playing around with the PropertiesLauncher and I noticed then the logging looks like:

...PropertiesLauncher : Property 'loader.path'[Loader-Path]  from environment: WEB-INF/classes,WEB-INF/lib,WEB-INF/lib-provided,file:/dummy
...PropertiesLauncher : Nested archive paths: null
...PropertiesLauncher : Property 'loader.path'[Loader-Path]  from environment: WEB-INF/classes,WEB-INF/lib,WEB-INF/lib-provided,file:/dummy
...PropertiesLauncher : Nested archive paths: [WEB-INF/classes/, WEB-INF/lib/, WEB-INF/lib-provided/, file:/dummy/]

I was confused by

Nested archive paths: null

and that's how I realized that the logging is using this.paths always, and that this is the only place using the paths field.