Fix regression in qx//
Fix regression in qx//

The Great Proc Refactor™[1] accidentally created a condition where
a Proc returned from a try {} was being sunk. This caused qx// with
processes that returned a non-zero exit status to explode.

Fix by simplifying the code

[1] https://github.com/rakudo/rakudo/commit/2ccd5cb1f5f0f88244afe971622f399e5aeee840

nbrown/rakudo,labster/rakudo,nbrown/rakudo,salortiz/rakudo,nbrown/rakudo,nbrown/rakudo,rakudo/rakudo,usev6/rakudo,sjn/rakudo,raydiak/rakudo,raydiak/rakudo,Gnouc/rakudo,awwaiid/rakudo,MasterDuke17/rakudo,tony-o/rakudo,tbrowder/rakudo,tbrowder/rakudo,raydiak/rakudo,lucasbuchala/rakudo,jonathanstowe/rakudo,sjn/rakudo,softmoth/rakudo,softmoth/rakudo,lucasbuchala/rakudo,tbrowder/rakudo,jonathanstowe/rakudo,tony-o/rakudo,awwaiid/rakudo,tony-o/rakudo,MasterDuke17/rakudo,awwaiid/rakudo,Gnouc/rakudo,labster/rakudo,tbrowder/rakudo,MasterDuke17/rakudo,softmoth/rakudo,sjn/rakudo,softmoth/rakudo,usev6/rakudo,salortiz/rakudo,raydiak/rakudo,nbrown/rakudo,tbrowder/rakudo,rakudo/rakudo,Gnouc/rakudo,usev6/rakudo,salortiz/rakudo,MasterDuke17/rakudo,usev6/rakudo,lucasbuchala/rakudo,Gnouc/rakudo,MasterDuke17/rakudo,Gnouc/rakudo,jonathanstowe/rakudo,labster/rakudo,softmoth/rakudo,lucasbuchala/rakudo,sjn/rakudo,tbrowder/rakudo,lucasbuchala/rakudo,jonathanstowe/rakudo,salortiz/rakudo,Gnouc/rakudo,jonathanstowe/rakudo,rakudo/rakudo,tony-o/rakudo,labster/rakudo,labster/rakudo,salortiz/rakudo,sjn/rakudo,rakudo/rakudo,tony-o/rakudo,awwaiid/rakudo,awwaiid/rakudo,usev6/rakudo,labster/rakudo,tony-o/rakudo,rakudo/rakudo,rakudo/rakudo,salortiz/rakudo,nbrown/rakudo,MasterDuke17/rakudo