Clean up of RSpec/LetSetup within spec/models (#28444)

spec/models/account_spec.rb

@@ -954,6 +954,7 @@ RSpec.describe Account do
 
       it 'returns every usable non-suspended account' do
         expect(described_class.searchable).to contain_exactly(silenced_local, silenced_remote, local_account, remote_account)
+        expect(described_class.searchable).to_not include(suspended_local, suspended_remote, unconfirmed, unapproved)
       end
 
       it 'does not mess with previously-applied scopes' do