Update Blog tests

Due to changing the way blogs are retrieved the test function was looking at the wrong blog when verifying.

lvlgg_backend/blog/tests.py

@@ -111,7 +111,7 @@ def test_get_blogs(self):
             self.assertIn('id', blog)
             self.assertIn('title', blog)
 
-        first_blog = blogs[1]
+        first_blog = blogs[0]
         self.assertEqual(first_blog['title'], payload['title'])