fix(loader): allow 'ng' module to be extended with filters/directives/etc

Due to a regression in c0b4e2d, it is no longer possible to add new
controllers, directives, filters, or animations to the `ng` module. This is
becuase `config` blocks are always evaluated after regular invoke blocks, and
the registration of these types depend on angular's config blocks to have been
run.

This solution simply ensures that `ng`'s config blocks are run before its
invoke blocks are run.

Closes #7709