fix: Cows are always visible and horn horns on the right square

[faucomte97]

This PR:

• Makes it so that cows are always visible ie from the moment the level is loaded.
• Fixes the distance at which the cow is detected, so that the horn needs to be sounded just before the van crashes into it instead of one square before.

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This change is 

[SKairinos]

Reviewed 3 of 3 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @faucomte97)

[SKairinos]

Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @faucomte97)