Equal balloon spawn chances in development mode

[SimonStnn]

close #269

[SimonStnn]

Double checked and this will not run in production.

// Output code
// e is balloonClasses and t is spawnChances
const e = Object.values(a),
  t = e.map((e) => e.spawn_chance),
  r = new ((0, d.weightedRandom)(e, t, { default: a.Default }))();