Fix Controller Names on Tests

[Janell-Huyck]

In a handful of the routing tests, the incorrect controller is being referenced, which brings in the incorrect context. Correct the routing tests controllers so that they are testing the correct routes. Example:
spec/routing/digital_projects_routing_spec.rb
currently:
RSpec.describe BookChaptersController, type: :routing do
should be:
RSpec.describe DigitalProjectsController, type: :routing do