Pass InjectWriter contsructor parameters in the correct order

Previously `InjectWriter` constructor params were passed in the incorrect order that caused generating a Javadoc for the view holder class with 'null' instead of a real layout file name:

/**
     * This class contains all butterknife-injected Views & Layouts from layout file 'null'
     * for easy to all layout elements.
...
**/

This PR fixes it.