Simplify files list
    
    Avoid using mixed "%{name}" and "gnome-builder" in the %files list and
    just use "gnome-builder" everywhere to make it more readable.
    Semantically, %{name} means the _package_ (spec file) name and using
    constructions like %{name}-builder in the %files list don't make a whole
    lot of sense semantically and don't improve spec file readability.