fix: database save method (#358)

Fix the issue in the database module where existing databases are not reused when reloading the game.

Author: YueHua46

scripts/database/index.ts

@@ -90,7 +90,7 @@ export class Database<V = any> {
     public save(): void {
         const stringified = JSON.stringify(this.cache)
         const index = Math.ceil(stringified.length / 32000)
-        world.setDynamicProperty(`${this.name}Index`)
+        world.setDynamicProperty(`${this.name}Index`, index)
         for (let i = 0; i < index; i++) {
             world.setDynamicProperty(`${this.name}:${i}`, stringified.slice(i * 32000, (i + 1) * 32000))
         }
@@ -122,4 +122,4 @@ export class Database<V = any> {
 system.runInterval(() => {
     //@ts-ignore
     Database.save()
-}, 1200)
+}, 1200)