Lesson 14 exercise 1 - you can complete exercise without multiplying correctly

Describe the bug A clear and concise description of what the bug is.

To Reproduce Steps to reproduce the bug:

Go to lesson 14 exercise 1
Run code:
```
var level = 1
var max_health = 100
```

func level_up(): level+=1 max_health+=max_health/10 max_health*=1



**Expected behavior**
Fail the exercise because we are not multiplying by 1.1 but using addiction 

**Screenshots**
![image](https://github.com/GDQuest/learn-gdscript/assets/64694795/4e6ffb09-4b0f-494c-b1f2-f5f40cad4451)

**Information about your device (please complete the following information):**
 - Operating System: Linux Debian
 - Version: Learn GDScript 1.5.2 from github releases zip file

GDQuest / learn-gdscript

Lesson 14 exercise 1 - you can complete exercise without multiplying correctly #907