Use ids instead of contents for identifying deleted note

Author: vejol

src/content/4/fi/osa4b.md

@@ -790,8 +790,8 @@ test('a note can be deleted', async () => {
 
   const notesAtEnd = await helper.notesInDb()
 
-  const contents = notesAtEnd.map(n => n.content)
-  assert(!contents.includes(noteToDelete.content))
+  const ids = notesAtEnd.map(n => n.id)
+  assert(!ids.includes(noteToDelete.id))
 
   assert.strictEqual(notesAtEnd.length, helper.initialNotes.length - 1)
 })
@@ -1082,8 +1082,8 @@ describe('when there is initially some notes saved', () => {
 
       const notesAtEnd = await helper.notesInDb()
 
-      const contents = notesAtEnd.map(n => n.content)
-      assert(!contents.includes(noteToDelete.content))
+      const ids = notesAtEnd.map(n => n.id)
+      assert(!ids.includes(noteToDelete.id))
 
       assert.strictEqual(notesAtEnd.length, helper.initialNotes.length - 1)
     })