Fix broken bezier curve benchmark (#14677)

# Objective

Apparently #14382 broke this, but it's not a part of CI, so it wasn't
found until earlier today.

## Solution

Update the benchmark like we updated the examples.

## Testing

Running `cargo bench` actually works now.

benches/benches/bevy_math/bezier.rs

@@ -20,7 +20,8 @@ fn cubic_2d(c: &mut Criterion) {
  vec2(1.0, 0.0),
  vec2(1.0, 1.0),
  ]])
- .to_curve();
+ .to_curve()
+ .expect("Unable to build a curve from this data");
  c.bench_function("cubic_position_Vec2", |b| {
  b.iter(|| black_box(bezier.position(black_box(0.5))));
  });
@@ -33,7 +34,8 @@ fn cubic(c: &mut Criterion) {
  vec3a(1.0, 0.0, 0.0),
  vec3a(1.0, 1.0, 1.0),
  ]])
- .to_curve();
+ .to_curve()
+ .expect("Unable to build a curve from this data");
  c.bench_function("cubic_position_Vec3A", |b| {
  b.iter(|| black_box(bezier.position(black_box(0.5))));
  });
@@ -46,7 +48,8 @@ fn cubic_vec3(c: &mut Criterion) {
  vec3(1.0, 0.0, 0.0),
  vec3(1.0, 1.0, 1.0),
  ]])
- .to_curve();
+ .to_curve()
+ .expect("Unable to build a curve from this data");
  c.bench_function("cubic_position_Vec3", |b| {
  b.iter(|| black_box(bezier.position(black_box(0.5))));
  });
@@ -59,7 +62,8 @@ fn build_pos_cubic(c: &mut Criterion) {
  vec3a(1.0, 0.0, 0.0),
  vec3a(1.0, 1.0, 1.0),
  ]])
- .to_curve();
+ .to_curve()
+ .expect("Unable to build a curve from this data");
  c.bench_function("build_pos_cubic_100_points", |b| {
  b.iter(|| black_box(bezier.iter_positions(black_box(100)).collect::<Vec<_>>()));
  });
@@ -72,7 +76,8 @@ fn build_accel_cubic(c: &mut Criterion) {
  vec3a(1.0, 0.0, 0.0),
  vec3a(1.0, 1.0, 1.0),
  ]])
- .to_curve();
+ .to_curve()
+ .expect("Unable to build a curve from this data");
  c.bench_function("build_accel_cubic_100_points", |b| {
  b.iter(|| black_box(bezier.iter_positions(black_box(100)).collect::<Vec<_>>()));
  });