Fix compliance framework migration on CE

This change fixes the compliance framework migration when it's running
on a downgraded EE -> CE database.

changelogs/unreleased/fix-ee-compliance-inline-data-migration-on-ce.yml

+---
+title: Fix compliance framework database migration on CE instances
+merge_request: 46761
+author:
+type: fixed

db/post_migrate/20201005094331_migrate_compliance_framework_enum_to_database_framework_record.rb

@@ -52,8 +52,6 @@ class MigrateComplianceFrameworkEnumToDatabaseFrameworkRecord < ActiveRecord::Mi
   end
 
   def up
-    return unless Gitlab.ee?
-
     TmpComplianceFramework.reset_column_information
     TmpProjectSettings.reset_column_information
 

spec/migrations/migrate_compliance_framework_enum_to_database_framework_record_spec.rb

@@ -30,11 +30,6 @@ RSpec.describe MigrateComplianceFrameworkEnumToDatabaseFrameworkRecord, schema:
 
   subject { described_class.new.up }
 
-  context 'when Gitlab.ee? is true' do
-    before do
-      expect(Gitlab).to receive(:ee?).and_return(true)
-    end
-
   it 'updates the project settings' do
     subject
 
@@ -54,17 +49,4 @@ RSpec.describe MigrateComplianceFrameworkEnumToDatabaseFrameworkRecord, schema:
 
     expect(compliance_management_frameworks.count).to eq(3)
   end
-  end
-
-  context 'when Gitlab.ee? is false' do
-    before do
-      expect(Gitlab).to receive(:ee?).and_return(false)
-    end
-
-    it 'does nothing' do
-      subject
-
-      expect(compliance_management_frameworks.count).to eq(0)
-    end
-  end
 end