Hotfix for NaN luck (#1840)

Makes luck default to 0 if false-y

src/modifier/modifier-type.ts

@@ -1875,8 +1875,9 @@ export class ModifierTypeOption {
 }
 
 export function getPartyLuckValue(party: Pokemon[]): integer {
-  return Phaser.Math.Clamp(party.map(p => p.isFainted() ? 0 : p.getLuck())
+  const luck = Phaser.Math.Clamp(party.map(p => p.isFainted() ? 0 : p.getLuck())
     .reduce((total: integer, value: integer) => total += value, 0), 0, 14);
+  return luck || 0;
 }
 
 export function getLuckString(luckValue: integer): string {