Remove an `is rw` on an @ parameter.
Remove an `is rw` on an @ parameter.

dankogai/roast,skids/roast,bitrauser/roast,perl6/roast,skids/roast,zostay/roast,bitrauser/roast,b2gills/roast,dogbert17/roast,dankogai/roast,b2gills/roast,skids/roast,dankogai/roast,cygx/roast,cygx/roast,cygx/roast,dogbert17/roast,zostay/roast,zostay/roast,b2gills/roast