[P3] Fix "falsex" type hint for Sheer Cold against ice types (#4638)

Co-authored-by: NightKev <34855794+DayKev@users.noreply.github.com>

src/data/move.ts

@@ -4556,19 +4556,20 @@ export class WaterSuperEffectTypeMultiplierAttr extends VariableMoveTypeMultipli
 export class IceNoEffectTypeAttr extends VariableMoveTypeMultiplierAttr {
   /**
    * Checks to see if the Target is Ice-Type or not. If so, the move will have no effect.
-   * @param {Pokemon} user N/A
-   * @param {Pokemon} target Pokemon that is being checked whether Ice-Type or not.
-   * @param {Move} move N/A
-   * @param {any[]} args Sets to false if the target is Ice-Type, so it should do no damage/no effect.
-   * @returns {boolean} Returns true if move is successful, false if Ice-Type.
+   * @param user n/a
+   * @param target The {@linkcode Pokemon} targeted by the move
+   * @param move n/a
+   * @param args `[0]` a {@linkcode Utils.NumberHolder | NumberHolder} containing a type effectiveness multiplier
+   * @returns `true` if this Ice-type immunity applies; `false` otherwise
    */
   apply(user: Pokemon, target: Pokemon, move: Move, args: any[]): boolean {
+    const multiplier = args[0] as Utils.NumberHolder;
     if (target.isOfType(Type.ICE)) {
-      (args[0] as Utils.BooleanHolder).value = false;
-      return false;
-    }
+      multiplier.value = 0;
       return true;
     }
+    return false;
+  }
 }
 
 export class FlyingTypeMultiplierAttr extends VariableMoveTypeMultiplierAttr {