add wallsCollider into snake

[hiyokun-d]

modified:   src/scripts/classes/betterboard.js
modified:   src/scripts/classes/snake.js
modified:   yarn.lock

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• [x] I have performed a self-review of my code
• [ ] I assure there is no similar/duplicate pull request regarding same issue

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[devsargam]

@hiyokun-d please, mention what changes you have made!

[devsargam]

@hiyokun-d also the collision with walls thing is still not working if that feature is complete

[hiyokun-d]

@hiyokun-d also the collision with walls thing is still not working if that feature is complete

I just set it to work in hard difficulty so if in the other difficulty it won't work so it will be challenging

[hiyokun-d]

@hiyokun-d please, mention what changes you have made!

Sorry, I forgot to put the changes I'm just modified the snake class also simpleboard and I forgot what I add in that file sorry

[devsargam]

@hiyokun-d thanks for your contribution