[#4395] Populate roll data for scrolls with spell level

Created spell scrolls are missing `@item.level` in their roll
data. This adds that value to roll data so long as the `spellLevel`
flag is present. This also sets the `flags.dnd5e.scaling` flag
when creating the scroll to ensure other scaling occurs properly.

Closes #4395

module/data/item/consumable.mjs

@@ -246,4 +246,16 @@ export default class ConsumableData extends ItemDataModel.mixin(
       .filter(p => p !== "material").forEach(p => valid.add(p));
     return valid;
   }
+
+  /* -------------------------------------------- */
+  /*  Helpers                                     */
+  /* -------------------------------------------- */
+
+  /** @inheritDoc */
+  getRollData(...options) {
+    const data = super.getRollData(...options);
+    const spellLevel = this.parent.getFlag("dnd5e", "spellLevel");
+    if ( spellLevel ) data.item.level = spellLevel.value ?? spellLevel.base;
+    return data;
+  }
 }

module/documents/item.mjs

@@ -1640,6 +1640,7 @@ export default class Item5e extends SystemDocumentMixin(Item) {
     const flags = itemData.flags ?? {};
     if ( Number.isNumeric(config.level) ) {
       flags.dnd5e ??= {};
+      flags.dnd5e.scaling = Math.max(0, config.level - spell.system.level);
       flags.dnd5e.spellLevel = {
         value: config.level,
         base: spell.system.level