Make providers all selectable_school in specs

spec/system/candidate_interface/course_selection/candidate_arrives_from_find_not_signed_in_spec.rb

@@ -53,7 +53,7 @@ def given_i_am_signed_out
   end
 
   def and_the_course_i_selected_only_has_one_site
-    @course = create(:course, :open, name: 'Potions')
+    @course = create(:course, :open, name: 'Potions', provider: create(:provider, selectable_school: true))
     @site = create(:site, provider: @course.provider)
     create(:course_option, site: @site, course: @course)
   end
@@ -151,6 +151,7 @@ def given_the_course_i_selected_has_multiple_sites
       :course,
       :open,
       :with_both_study_modes,
+      provider: create(:provider, selectable_school: true),
       name: 'Herbology',
     )
     @site1 = create(:site, provider: @course_with_multiple_sites.provider)
@@ -198,7 +199,7 @@ def and_i_see_a_link_to_the_course_on_find
 private
 
   def application_choice_for_candidate(candidate:, application_choice_count:)
-    provider = create(:provider)
+    provider = create(:provider, selectable_school: true)
     application_form = create(:application_form, candidate:)
     application_choice_count.times { course_option_for_provider(provider:) }
     provider.courses.each do |course|

spec/system/candidate_interface/course_selection/candidate_arrives_from_find_with_a_course_with_multiple_sites_spec.rb

@@ -22,7 +22,7 @@
   end
 
   def given_there_is_a_provider_with_a_course_that_is_only_accepting_applications_on_apply
-    @provider = create(:provider, code: '8N5', name: 'Snape University')
+    @provider = create(:provider, code: '8N5', name: 'Snape University', selectable_school: true)
     @course = create(:course, :open, name: 'Potions', provider: @provider)
     first_site = create(
       :site,

spec/system/candidate_interface/course_selection/candidate_arrives_from_find_with_a_course_with_multiple_study_modes_spec.rb

@@ -28,7 +28,7 @@
   end
 
   def given_there_is_a_provider_with_a_course_that_is_only_accepting_applications_on_apply
-    @provider = create(:provider, name: 'Vim masters')
+    @provider = create(:provider, name: 'Vim masters', selectable_school: true)
 
     @first_site = create(:site, provider: @provider, name: 'Site 1')
     @second_site = create(:site, provider: @provider, name: 'Site 2')

spec/system/candidate_interface/course_selection/candidate_edits_course_choices_spec.rb

@@ -77,7 +77,7 @@ def given_i_am_signed_in
   end
 
   def and_there_is_a_course_with_one_course_option
-    @provider = create(:provider)
+    @provider = create(:provider, selectable_school: true)
     create(:course, :open, name: 'English', provider: @provider, study_mode: :full_time)
 
     course_option_for_provider(provider: @provider, course: @provider.courses.first)

spec/system/candidate_interface/course_selection/candidate_selecting_a_course_study_mode_spec.rb

@@ -24,7 +24,7 @@ def given_i_am_signed_in
   end
 
   def and_there_are_course_options
-    @provider = create(:provider, name: 'University of Alien Dance')
+    @provider = create(:provider, name: 'University of Alien Dance', selectable_school: true)
 
     @first_site = create(:site, provider: @provider, name: 'Site 1')
     @second_site = create(:site, provider: @provider, name: 'Site 2')

spec/system/candidate_interface/course_selection/candidate_selecting_a_course_with_multiple_sites_spec.rb

@@ -74,7 +74,7 @@ def application_choice
   end
 
   def and_there_are_course_options
-    @provider = create(:provider, name: 'Gorse SCITT', code: '1N1')
+    @provider = create(:provider, name: 'Gorse SCITT', code: '1N1', selectable_school: true)
     first_site = create(
       :site,
       name: 'Main site',