fix expected values for ratings and src tests

Signed-off-by: Arthur Lu <learthurgo@gmail.com>

source/ReviewDetails.html

@@ -72,7 +72,7 @@
         </label>
   
       </fieldset>
-      <button type="submit" value="Submit">Add Review</button>
+      <button type="submit" id="save-btn" value="Submit">Add Review</button>
       </form>
 </body>
 </html>