concept/lasagna: change last totalTimeInMinutes test to use distinct …

…values from the first test to make them harder to confuse

exercises/concept/lasagna/lasagna.spec.js

@@ -37,6 +37,6 @@ describe('totalTimeInMinutes', () => {
   test('calculates the total cooking time', () => {
     expect(totalTimeInMinutes(1, 5)).toBe(7);
     expect(totalTimeInMinutes(4, 15)).toBe(23);
-    expect(totalTimeInMinutes(1, 35)).toBe(37);
+    expect(totalTimeInMinutes(1, 30)).toBe(32);
   });
 });