chore: change weights for new square generation

src/game.rs

@@ -272,7 +272,7 @@ fn spawn_new_square (mut field: ResMut<Field>) {
     let rng = &mut thread_rng();
     let Some(empty) = field.0.iter().enumerate().filter(|&(_, &val)| val == 0).map(|(idx, _)| idx).choose(rng) else { return };
     let choices = [1, 2, 3];
-    let weights = [8, 4, 1];
+    let weights = [8, 3, 1];
     let Ok(index) = WeightedIndex::new(&weights) else { return };
     field.0[empty] = choices[index.sample(rng)];
 }