fix(kit_creation): Simplify item visibility check in kit system tests

Author: Olexii Kasianenko

spec/system/kit_system_spec.rb

@@ -64,8 +64,7 @@
         expect(Kit.last.name).to eq(kit_traits[:name])
         expect(Kit.last.visible_to_partners).to eq(false)
         expect(Kit.last.value_in_dollars).to eq(kit_value_in_dollars)
-        expect(items[0].reload.visible_to_partners).to eq(false)
-        expect(items[1].reload.visible_to_partners).to eq(false)
+        expect(Kit.last.item.reload.visible_to_partners).to eq(false)
         expect(items[0].reload.value_in_dollars).to eq(value_in_dollars)
         expect(items[1].reload.value_in_dollars).to eq(value_in_dollars)
       }.to change(Kit, :count).by(1)